#hip41378 — Public Fediverse posts

This is the spectroscopic transit of a #planet with an orbital period of 1.5 YEARS !! #HIP41378 🪐

In case you missed the great paper led by @sgrouffal (#ProudAdvisor), arXived over the summer, here is a recap'.

The planet HIP41378 f is a Saturn-sized transiting planet with an orbital period of 542 days. It means we can observe its transit only once every 1.5 years - it's actually once every 3 years from the ground as the host star is too close to the Sun (as seen from the Earth) every other transits.

With such a long orbital period and a nearly circular orbit, the transit event lasts 19 hours (!). Hence, from the ground, any observer could only observe a tiny fraction of the transit. To overcome this issue, back in 2022, we set up a worldwide collaboration of almost all high-resolution radial-velocity spectrographs across the globe. Over the same night, all the instruments observed the target HIP41378 at the time of planet'f transit, allowing us to detect the Rossiter-McLaughlin (RM) effect.

The RM effect is measuring the planet's orbital obliquity, i.e. the angle between the orbital plane and the spin axis of the star. While this angle is ~0º in the solar system, for HIP41378 it reaches Ψ=~52º.

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#Science #Space #Exoplanet #Astrophysics #Astronomy #telescope

This is the spectroscopic transit of a #planet with an orbital period of 1.5 YEARS !! #HIP41378 🪐

In case you missed the great paper led by @sgrouffal (#ProudAdvisor), arXived over the summer, here is a recap'.

The planet HIP41378 f is a Saturn-sized transiting planet with an orbital period of 542 days. It means we can observe its transit only once every 1.5 years - it's actually once every 3 years from the ground as the host star is too close to the Sun (as seen from the Earth) every other transits.

With such a long orbital period and a nearly circular orbit, the transit event lasts 19 hours (!). Hence, from the ground, any observer could only observe a tiny fraction of the transit. To overcome this issue, back in 2022, we set up a worldwide collaboration of almost all high-resolution radial-velocity spectrographs across the globe. Over the same night, all the instruments observed the target HIP41378 at the time of planet'f transit, allowing us to detect the Rossiter-McLaughlin (RM) effect.

The RM effect is measuring the planet's orbital obliquity, i.e. the angle between the orbital plane and the spin axis of the star. While this angle is ~0º in the solar system, for HIP41378 it reaches Ψ=~52º.

[1/2]

#Science #Space #Exoplanet #Astrophysics #Astronomy #telescope

Out of the 13 spectrographs that participated in the worldwide campaign:
- 1 got clouds and did not observe
- 1 got a serious damage on the primary mirror and is off for a couple months
- 11 secured data

✅✅✅✅✅✅✅✅✅✅✅❌❌

#HIP41378 #AstronomerLife

2 weeks ago, we were observing the rare transit of the #exoplanet #HIP41378 f. It was one of the largest ground-based observing campaign on an exoplanet so far.

Today, we did our first #zoom call with the PIs (Principle Investigators) of the spectroscopic data, in order to decide the strategy for data reduction, analysis and #publication. Another zoom is schedule later this week for the photometric campaign.

The data are so great that we believe we have room for 4+ #papers.

#AstronomerLife

If you want to get some news on the #HIP41378 system that I observed last weekend, you shall follow @sgrouffal.

She is doing a #PhD thesis with me on the #PLATO space mission from the European #Space agency #ESA. She is also working on the analysis of exquisite data of #HIP41378 taken with the very large telescope #VLT, in #Chile.

She is also the artist who produced this great #video of the system 🤩

#Astronomy #Astrophysics

Wow, this campaign on #HIP41378 f has been incredible ! I can tell you it's a great success. I am receiving many emails from colleagues across the #world reporting me they managed to observe the #transit. Now will start the long process of reducing / analysing / publishing the data.

Stay tuned.

I hope you enjoyed being informed about this campaign.

Next rendez-vous with #HIP41378 is planned for early January, with the transit of planet d that will be observed by #CHEOPS 🛰️ .

#astronomy

Wow, this campaign on #HIP41378 f has been incredible ! I can tell you it's a great success. I am receiving many emails from colleagues across the #world reporting me they managed to observe the #transit. Now will start the long process of reducing / analysing / publishing the data.

Stay tuned.

I hope you enjoyed being informed about this campaign.

Next rendez-vous with #HIP41378 is planned for early January, with the transit of planet d that will be observed by #CHEOPS 🛰️ .

#astronomy

📅 2022-11-13 22:36 UT

According to the best ephemeris, the forth contact of the #transit of #HIP41378 f should occur now.

#Astronomy

📅 2022-11-13 21:23 UT

According to the best ephemeris, the third contact of the #transit of #HIP41378 f should occur now.

#Astronomy

@AlexSanterne Merci pour l'explication et la petite simulation. Je viens d'apprendre quelque chose 😁 est ce qu'un spectre de transmission d'#HIP41378 a été tenté durant le transit ?

The #Rossiter-#McLaughlin effect is also called the spectroscopic transit. Since the #star is rotating, one side is coming towards us and is blue-shifted while the other side is moving away from us and is red-shifted. As the planet is crossing the stellar disk, it blocks a part of the blue-, then red-shifted part. The Rossiter-McLaughlin is a radial velocity anomaly during transit.

#HIP41378

GIF from my Phd student Salomé GROUFFAL (LAM / AMU / CNES / Institut origines).

👀

Very preliminary plot of the #HARPS-N radial-velocity data of #HIP41378 f obtained last night with the #TNG at #LaPalma.

It shows the #Rossiter-#McLaughlin effect that is clearly detected and in phase with the photometric ingress.

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#Astronomy #AstronomerLife

Folks, look what I just received in my mailbox. 🤩

A confirmed ingress of #HIP41378, perfectly on time !

The winner is the 80-cm telescope from Osservatorio Polifunzionale del Chianti 🇮🇹

cc @hubble86

Folks, look what I just received in my mailbox. 🤩

A confirmed ingress of #HIP41378, perfectly on time !

The winner is the 80-cm telescope from Osservatorio Polifunzionale del Chianti 🇮🇹

cc @hubble86

Just woke up from a crazy #night observing #HIP41378 with so many instruments. Quick updated status (from what I just red):
- photometry: so far it seems only @hubble86 got a good weather during the expected ingress 🤞
- spectroscopy: data from #CARMENES / #CalarAlto, #HARPS-N / #TNG & #ESPRESSO / #ESO are in my mailbox. ✅

No news yet from the US-based observatories (and India who haven't started observing yet).

We are still IN TRANSIT.

#AstronomerLife #Astronomy

Good news ! after some fear because of strong wind, @JuliaVSeidel, is currently observing #HIP41378 with #ESPRESSO / #ESO-#VLT. Below is the view of the star (in orange) in the VLT focal plane entering the fiber feeding the light to the spectrograph.

I also got good news from #CalarAlto where they managed to observe the target under very good and stable #conditions.

I am not aware of a transit detection in photometry over Europe yet. Weather wasn't great for photometry.

#AstronomerLife

Good news ! after some fear because of strong wind, @JuliaVSeidel, is currently observing #HIP41378 with #ESPRESSO / #ESO-#VLT. Below is the view of the star (in orange) in the VLT focal plane entering the fiber feeding the light to the spectrograph.

I also got good news from #CalarAlto where they managed to observe the target under very good and stable #conditions.

I am not aware of a transit detection in photometry over Europe yet. Weather wasn't great for photometry.

#AstronomerLife

The night is getting to its end over #Europe. Here is the status of the #HIP41378 f campaign so far:
- #HauteProvence observatory: we got ONE (likely out-of-transit) spectrum through a hole in the clouds
- #CalarAlto: all-sky camera showed stars all the night. I've not heard back from the observatory yet, but it looks good
- #LaPalma had lot of cirrus passing. Likely a killer for photometry, but OK for spectroscopy. 🤞

Now, it's time for #ESO to start the show !

#AstronomerLife #astronomy

The night is getting to its end over #Europe. Here is the status of the #HIP41378 f campaign so far:
- #HauteProvence observatory: we got ONE (likely out-of-transit) spectrum through a hole in the clouds
- #CalarAlto: all-sky camera showed stars all the night. I've not heard back from the observatory yet, but it looks good
- #LaPalma had lot of cirrus passing. Likely a killer for photometry, but OK for spectroscopy. 🤞

Now, it's time for #ESO to start the show !

#AstronomerLife #astronomy

📅 2022-11-13 04:49 UT

According to the best ephemeris, the second contact of the #transit of #HIP41378 f should occur now.

#Astronomy

📅 2022-11-13 03:36 UT

According to the best ephemeris, the first contact of the #transit of #HIP41378 f should occur now.

#Astronomy

📅 2022-11-13 03:36 UT

According to the best ephemeris, the first contact of the #transit of #HIP41378 f should occur now.

#Astronomy

#HIP41378 f #transit

We are observing from the #HauteProvence observatory !!!!

Conditions are sub-nominal, but at least we are collecting photons. Let's hope for the best. 🤞

#AstronomerLife #astronomy

See how the #clouds are vanishing when we get closer to the transit of #HIP41378 f ! 🤞

#AstronomerLife #Astronomy

See how the #clouds are vanishing when we get closer to the transit of #HIP41378 f ! 🤞

#AstronomerLife #Astronomy

#Hope

#AstronomerLife #HIP41378 #Astronomy

Me right now awaiting to observe a once-in-a-decade event ...

#HIP41378
#AstronomerLife #Astronomy

Me right now awaiting to observe a once-in-a-decade event ...

#HIP41378
#AstronomerLife #Astronomy

#HIP41378 f THIS IS TONIGHT !!

The #night has already started in Europe. Current #weather status is:

- OHP ❌
- Calar Alto ✅
- La Palma ❌

But the weather in Chile is great ! ✅

#AstronomerLife #observation #Astronomy

Huh, so with the #transit of #HIP41378 f campaign going on, *and* simultaneously everything suddenly feeling so pioneer-y around here, I am getting some seriously nostalgic throw-backs to Whole Earth Telescope times.

I mean just look at those visuals of the archived collaboration web pages ...!

https://www.physics.udel.edu/gp/darc/wet/index.html
https://wet.physics.iastate.edu/

Definitely strange to be looking at all the names on the community page, too.

Wow, colleagues at the #SETI institute collaborating with the #Unistellar citizen-scientist network made this great animation showing the places from which we could observe the #transit of the #exoplanet #HIP41378 f on November 12-13.

Answer: from (almost) everywhere.

Read more / source: https://www.unistellar.com/blog/observe-a-saturn-like-planet/

#astronomy

Update on the campaign to observe the #transit of #HIP41378 f on Nov. 12. We are one day before !!!

Main observatory statuts:
- #Wendelstein obs. 🟢
- #SOPHIE / #HauteProvence 🟢
- #CARMENES / #CalarAlto 🟢
- #MERCATOR / #LaPalma 🟢
- #HARPS-N / #LaPalma 🟢
- #ESPRESSO / #ESO Paranal 🟢
- #EXPRES / #Lowell 🟢
- #NEID / #KittPeak 🟠
- #MINERVA / #FWLO 🟢
- #HIRES / #MaunaKea 🟢
- #MAROON-X / #MaunaKea 🔴
- #SPIRou / #CFHT 🟢
- #PARAS / #MountAbu 🟢

#AstronomerLife #Astronomy #exoplanet

Just arrived at the #HauteProvence #observatory. This is the view from the catwalk of the 1.93m #telescope I will be using for the next 5 #nights, weather permitting.
So far, the #sky is 🔵
I love when it’s 🔵

Tonight I will hunt for #exoplanets and start observing #HIP41378 🔭

@JuliaVSeidel: how is your sky ? 🔵 I guess as well ?

Credits: A. Santerne / OHP-CNRS

#Astronomy #AstronomerLife #Photography

Just arrived at the #HauteProvence #observatory. This is the view from the catwalk of the 1.93m #telescope I will be using for the next 5 #nights, weather permitting.
So far, the #sky is 🔵
I love when it’s 🔵

Tonight I will hunt for #exoplanets and start observing #HIP41378 🔭

@JuliaVSeidel: how is your sky ? 🔵 I guess as well ?

Credits: A. Santerne / OHP-CNRS

#Astronomy #AstronomerLife #Photography

This week-end many telescopes in the world will be observing the transit of #HIP41378 f. One of them is the Telescopio Nazionale Galileo, aka #TNG from the Roque de Los Muchachos observatory, in the #canarias island of #LaPalma 🇪🇸.

I observed with the #TNG some time ago and made this #timelapse #video. In the foreground you have the 3.5m #TNG and in the backgound, the 10.2m Gran Telescopio del Canarias (#GTC).

credits: A. Santerne

#Astronomy #AstronomerLife

https://youtu.be/5ylieHiKQgo

We are now 3 years later, this is the next opportunity to observe that event which ended up to be (almost) a complete fiasco last time. The visibility of the star is much lower than in 2019, but we can still do something. However, this is really the unique opportunity we have to observe this even over the 2020's decade.

So, please keep your fingers crossed for clear skies, no technical issues, and for good data.

#ThreadEND THANKS !!

#astronomy #AstronomerLife #HIP41378

Unlike all the other observatory, #NGTS were not only able to detect (one part of) the 19-h long transit, but also measured precise transit timing which exhibited a large (quite unexpected) variation. The other observatory who managed to get some data, missed the transit.

So, out of all the instruments that were planned to observe #HIP41378 on 2019, November 25. ONLY ONE of them secure a detection.
reference: Bryant et al., 2021

#astronomy #AstronomerLife

So, at the end, out of the 5 spectroscopic facilities committed to this campaign, none was able to secure data. The only observatory which could have secure data (no clouds, no technical issue) was #ESO, but they forget to run that programme... 😡😡😡😡

The situation with photometry wasn't much better, as most of the instruments had relatively poor conditions ...

... except one: NGTS.

#astronomy #AstronomerLife #HIP41378

The observing conditions were perfect, the seeing (atmosphere turbulence) was perfect, the instrument stability was perfect ...

BUT ...

a drive of one of the telescope motor was broken and the 4.2m Discovery Channel Telescope at Lowell Observatory was not able to ... point the target ❌ 🤯

No problem, we still have 3 telescopes out of 5 that can observe part of the transit.

BUT ...

the sky were completely cloudy from those 3 observatories ! NO DATA ❌

#astronomy #AstronomerLife #HIP41378

Sometimes it takes time for the data to reach the archive, so I contacted #ESO staff and their answer was like:

"Ops, we are so so sorry, we completely forgot about your programme" 🤯 [no problem, I can wait for the next event, in 2036... 😡 ]

Then, I got another email from my US colleague observing with #EXPRES. The email title was "heartbreaking news from Lowell..."

#astronomy #AstronomerLife #HIP41378

The #transit was expected to start when it was the night in #Chile. So, #ESO were supposed to start the party. Observation there are performed in service, meaning the observatory staff are performing the observation for you. I was at the #HauteProvence observatory, observing with SOPHIE.

So, I wake up from my morning sleep, checked my emails: no news from #ESO. I checked the archive: no #data available. NOTHING ❌❌❌❌ 😡

#HIP41378 #astronomy #AstronomerLife

A few days before the event, the campaign was in a very good shape. Some #citizen scientists also jumped on board. Many telescopes were ready to observe that rare event !

BUT ...

#HIP41378 #Astronomy #AstronomerLife

We discovered a very interesting #exoplanet system (#HIP41378). It is very unique and extremely interesting. The #planet f is like in the middle of nowhere in the zoo of #exoplanets known at that time to transit bright #stars. Its orbital period is 542 days, meaning the opportunities to observe it in #transit are quite rare.

#Astronomy #AstronomerLife

This week-end, I will be on alert because there is the #transit of #HIP41378 f, a very cool and long-period transiting #exoplanet. I made a #thread pinned on my profile about this fascinating planetary system. I am really excited because I am awaiting this for 3 years !!

So, let me explain you what happened 3 years ago... let's go back to 2019 in this new #thread. ⤵️

#astronomy #AstronomerLife

Some update of the upcoming campaign to observe the #transit of #HIP41378 f on Nov. 12 (thread here: https://astrodon.social/@AlexSanterne/109298827881210776).

Main observatory statuts:
- #Wendelstein obs. 🟠
- #SOPHIE / #HauteProvence 🟠
- #CARMENES / #CalarAlto 🟢
- #HARPS-N / #LaPalma 🟠
- #ESPRESSO / #ESO Paranal 🟢
- #EXPRES / #Lowell 🟢
- #NEID / #KittPeak 🟠
- #MINERVA / #FWLO 🟢
- #HIRES / #MaunaKea 🟢
- #MAROON-X / #MaunaKea 🔴
- #PARAS / #MountAbu 🟢
Details ⤵️

#astrophysics #AstronomerLife #Astronomy #exoplanet

Over the next few weeks, I will be tooting A LOT about one very special and fascinating #exoplanet system: #HIP41378.

#Thread

The #star hosts 5 (+?) #exoplanets. Those exoplanets are #transiting in front of their host star which allow us to measure their radius. This #system is very special because the planets are orbiting at long orbital period. The 5 planets (called b, c, d, e, and f) have periods of 2 weeks, 1 month, 9 month, 1 yr and 1.5 yr (resp.).

#Astrodon #astronomy #astrophysics