Guðmundur Stefánsson
@gummiks
Astrophysicist working on exoplanets. Assistant Professor at @UvA_Amsterdam. Former NASA Sagan Fellow at @Princeton; @FulbrightPrgrm, @PSUScience
⚠️New paper!⚠️ We have discovered a planet, Gaia-4b, and a brown dwarf, Gaia-5b, using the @ESAGaia spacecraft. Gaia-4b is Gaia's first planet detected with astrometry alone and represents the tip-of-the-iceberg of the 100s-1000s of planets that Gaia is expected to detect.
A team including #PrincetonU professor Joshua Winn — and led by former postdoc @gummiks — discovered a massive hidden planet. Get to know Gaia-4b ⬇️ bit.ly/4b0BnfL
Een internationaal team van astronomen onder leiding van Guðmundur Stefánsson (Universiteit van Amsterdam) heeft het bestaan bevestigd van een planeet met een omlooptijd van 570 dagen en een massa van 12 Jupitermassa's, genaamd Gaia-4b. astronomie.nl/nieuws/gaias-e…
Congratulations to @ArvindFGupta for leading this discovery of the most eccentric transiting planet know using @NEID_at_WIYN @HPFspectrograph TESS, HARP-N. A beautiful and strange system amenable to further followup. @NOIRLabAstro @PSUScience @PSU_CEHW @PSUresearch @mcdonaldobs
Pausing my twitter hiatus to announce my new paper published in Nature today: nature.com/articles/s4158… We confirm and characterize TIC 241249530 b, a warm Jupiter on an eccentric & retrograde orbit, and we show that it is en route to becoming a hot Jupiter ⤵️
Science time! Back in 2001, when I had JUST gotten into exoplanets, the Swiss planet hunting team announced a *bonkers* planet, HD 80606b. It had an eccentricity of 0.93: basically like a comet! A period of 111 days, and a periapse that made it—briefly—a hot Jupiter.
Check out @ArvindFGupta's exciting discovery of the most eccentric transiting exoplanet (e=0.94) that is on a retrograde orbit published in @Nature today !
Pausing my twitter hiatus to announce my new paper published in Nature today: nature.com/articles/s4158… We confirm and characterize TIC 241249530 b, a warm Jupiter on an eccentric & retrograde orbit, and we show that it is en route to becoming a hot Jupiter ⤵️
The first paper from my PhD is published in Nature Astronomy! Link: nature.com/articles/s4155… ArXiv: arxiv.org/abs/2312.16924 A small thread describing the key results of the paper follows (1/n)
Delighted to announce that the next Bcool meeting take place from April 9-11th 2024 at @ASTRON_NL! The deadline for registration and abstract submission is March 8th. Details: indico.astron.nl/e/bcool2024
At @ConversationUS, @NASA Hubble Fellow @gummiks writes about the discovery of an exoplanet that is more than 13 times heavier than Earth. bit.ly/3uKre5S