Lightnews — Scholar-powered news

Reposted by Alex Santerne

Le Monde @lemonde.fr · 3d

Michel Mayor et Didier Queloz : « L’astrophysique vit un âge d’or »

Trente ans après leur découverte de la première exoplanète, les deux astronomes, récompensés du prix Nobel de physique en 2019, reviennent sur la façon dont leur annonce a changé l’astronomie moderne.

www.lemonde.fr

2 3 14

Alex Santerne @alexsanterne.bsky.social · 5d

If you have >10,000 unread emails, just click "consider them all as red" and you will come to the first category. 😀

1 3

Reposted by Alex Santerne

David Ho @davidho.bsky.social · 6d

That sounds like a lot of power. I hope we’re doing useful things with ChatGPT. 🙃

OpenAI's New Data Centers Will Draw More Power Than the Entirety of New York City, Sam Altman Says

OpenAI's planned AI data center projects would consume as much as the entire city of New York City and San Diego combined.

futurism.com

33 150 370

Reposted by Alex Santerne

Sylvain Breton @sy-brt.bsky.social · 9d

It is paper time ! If you wondered how the Gaia catalogue of solar-like rotators compared with the stars observed by the Kepler/K2 missions here are some elements of answers !
Here is the link to the article we published in A&A:
www.aanda.org/articles/aa/...

#stellarastro

The location in the sky of the K2 stars of the study together with the full sample of Gaia (orange) and Kepler (grey) solar-like rotators

1 3 9

Alex Santerne @alexsanterne.bsky.social · 14d

ça peut être un fil interminable... 😀

Alex Santerne @alexsanterne.bsky.social · 14d

👀

1

Reposted by Alex Santerne

Astropierre @astropierre.com · 17d

Comme chaque années, le célèbre prix Ig Nobel a été décerné pour récompenser les recherches scientifiques "qui font rire d'abord, et réfléchir ensuite".

Découvrons les lauréats de cette année.
Fil à dérouler ci-dessous ⬇️⬇️⬇️

1/n

Le fondateur des Ig Nobels, Marc Abrahams (à gauche de l'image), préside la cérémonie de remise des prix en 2013. A droite des chercheurs japonais dont 2 sont déguisés en souris.

7 190 330

Alex Santerne @alexsanterne.bsky.social · 19d

How much of them discovered / studied with the @eso.org telescopes ?

30% ?

Alex Santerne @alexsanterne.bsky.social · 22d

Vu que les détecteurs ne sont pas rond, c'est vraiment une bonne idée de faire des miroirs rectangulaires 🤪

3

Reposted by Alex Santerne

ESO @eso.org · 23d

Was it a good coating?

An engineer inspects a VLT primary mirror surface after coating.

Since telescopes spend the night under the stars, the mirrors accumulate dirt on their surfaces and are cleaned periodically. 🔭

A technician inspects a large, highly reflective telescope mirror inside a facility. The mirror reflects the technician's image with clarity. The surrounding structure is painted in bright yellow.

2 11 45

Alex Santerne @alexsanterne.bsky.social · 26d

Commandé ✅

2

Reposted by Alex Santerne

Hervé Cottin @hcottin.bsky.social · 28d

Après plus de deux ans de travail, et grâce à l'implication de près de 30 collègues chercheuses et chercheurs de presque tous les champs des sciences, voici enfin dans toutes les librairies "Le Grand Livre de l'Exobiologie".
@lisa-ipsl.bsky.social @upecofficiel.bsky.social @ipsl.bsky.social @cnes.fr

5 24 65

Alex Santerne @alexsanterne.bsky.social · 27d

Bravo, ça me donne des idées cadeaux ...

1 3

Reposted by Alex Santerne

Alex Santerne @alexsanterne.bsky.social · Sep 8

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 Salomé Grouffal (#ProudAdvisor), arXived over the summer, here is a recap'.

#Thread [1/8]

1 5 18

Alex Santerne @alexsanterne.bsky.social · Sep 8

I don't think referees have all rights. They have to review the scientific content and make sure the figures are clear enough. Figure styles are upon the responsibility of the journal & authors.
If I were you, I would contact the editor, to ask them to confirm this request / recommendation.

1 1

Alex Santerne @alexsanterne.bsky.social · Sep 8

cc @astropierre.com : tu avais pu suivre la campagne en avant première. Les résultats sont enfin disponibles ;-)

1 1

Alex Santerne @alexsanterne.bsky.social · Sep 8

For more information, check-out the preprint of the paper, accepted for publication in A&A : arxiv.org/abs/2507.01807

[8/8]

The star HIP 41378 potentially misaligned with its cohort of long-period planets

The obliquity between the stellar spin axis and the planetary orbit, detected via the Rossiter-McLaughlin (RM) effect, is a tracer of the formation history of planetary systems. While obliquity measur...

arxiv.org

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

One likely explanation would be a primordial tilt of the host star's spin axis relative to protoplanetary disk (due to magnetic interaction ?) from where the system formed, giving us insights on the past history of this fascinating system.
[7/8]

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

While spin-orbit misalignments have already been observed for planet very close to their stars, this is surprising for such a long-period planet in a multi-planetary system with resonances. Hypothesis like planet-planet scattering can be ruled out here to explain planet's f obliquity.
[6/8]

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

The Rossiter-McLaughlin 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.
[5/8]

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

To overcome this issue, we set up (in 2022) a 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 effect. [4/8]

1 1

Alex Santerne @alexsanterne.bsky.social · Sep 8

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.
[3/8]

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

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.
[2/8]

1

Alex Santerne @alexsanterne.bsky.social · Sep 8

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 Salomé Grouffal (#ProudAdvisor), arXived over the summer, here is a recap'.

#Thread [1/8]

1 5 18

Alex Santerne @alexsanterne.bsky.social · Sep 4

Tom Baycroft (Birmingham university) is presenting the latest results from the #BEPOP (Binary Escorted by Orbiting Planets) survey at #IPAG.

Perfect talk for #StarWars fans: we’re discovering Tatooine-like planets ⭐️⭐️🪐

1