#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.

[1/2]

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

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.

(1/2)

#Astronomy #AstronomerLife

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

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

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

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

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

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

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

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

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

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

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

We requested #ESO's director time on the #VLT ➡️ time granted on #ESPRESSO ✅
We requested time to the director of the #HauteProvence observatory ➡️ time granted on #SOPHIE ✅
We requested time to the director of the #CalarAlto observatory ➡️ time granted on the #CARMENES spectrograph ✅
We contacted a colleague who use a telescope in India ➡️ time granted on #PARAS ✅
We contacted by a colleague in the #US who developed a new spectrograph ➡️ time granted on EXPRES ✅

#AstronomerLife #HIP41378

I therefore looked at the next opportunities to observe it, especially from the ground, but also with the upcoming (at that time) #JWST. I thus plotted the visibility of the #target at the time of future #transits, OVER TWO DECADES.

BINGO ! The next transit was expected to be on 2019, November 25 and was expected to be well visible from the ground (the star is far away from the Sun). The next transit with similar visibility is only in 2036.

#astronomy #AstronomerLife #HIP41378

I therefore looked at the next opportunities to observe it, especially from the ground, but also with the upcoming (at that time) #JWST. I thus plotted the visibility of the #target at the time of future #transits, OVER TWO DECADES.

BINGO ! The next transit was expected to be on 2019, November 25 and was expected to be well visible from the ground (the star is far away from the Sun). The next transit with similar visibility is only in 2036.

#astronomy #AstronomerLife #HIP41378

I therefore looked at the next opportunities to observe it, especially from the ground, but also with the upcoming (at that time) #JWST. I thus plotted the visibility of the #target at the time of future #transits, OVER TWO DECADES.

BINGO ! The next transit was expected to be on 2019, November 25 and was expected to be well visible from the ground (the star is far away from the Sun). The next transit with similar visibility is only in 2036.

#astronomy #AstronomerLife #HIP41378

I therefore looked at the next opportunities to observe it, especially from the ground, but also with the upcoming (at that time) #JWST. I thus plotted the visibility of the #target at the time of future #transits, OVER TWO DECADES.

BINGO ! The next transit was expected to be on 2019, November 25 and was expected to be well visible from the ground (the star is far away from the Sun). The next transit with similar visibility is only in 2036.

#astronomy #AstronomerLife #HIP41378

I therefore looked at the next opportunities to observe it, especially from the ground, but also with the upcoming (at that time) #JWST. I thus plotted the visibility of the #target at the time of future #transits, OVER TWO DECADES.

BINGO ! The next transit was expected to be on 2019, November 25 and was expected to be well visible from the ground (the star is far away from the Sun). The next transit with similar visibility is only in 2036.

#astronomy #AstronomerLife #HIP41378

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

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

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

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

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

J'animerais avec Pierre Henriquet (aka #astropierre) le samedi 12 novembre à 16h une #conférence / Rencontre en ligne pour parler d'#exoplanètes. Je serais notamment en direct depuis la grande #coupole de l'#observatoire de #HauteProvence, quelques heures avant le début du transit de la fascinante exoplanète #HIP41378 f.

Ticket 3€ (pour soutenir le travail de médiation d'astropierre) sur
https://utip.io/astropierre/RencontreAlexandreSanterne