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#TESS

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Mikko Tuomi

Transiting #Exoplanet Survey Satellite is not only good at detecting #exoplanets.

Here are 11 new transiting brown dwarfs and very low-mass #stars from #TESS consisting of 5 brown dwarf companions and 6 very low mass stellar companions ranging in mass from 25 to 128 Jupiter masses.

The #eccentricity distribution for the transiting brown dwarf sample does not support previous claims of a transition between planetary and stellar formation at ∼42 Jupiter masses.

astrobiology.com/2025/01/11-ne

Astrobiology · 11 New Transiting Brown Dwarfs and Very Low Mass Stars from TESS - AstrobiologyWe present the discovery of 11 new transiting brown dwarfs and low-mass M-dwarfs from NASA’s TESS mission: TOI-2844, TOI-3122, TOI-3577, TOI-3755, TOI-4462, TOI-4635, TOI-4737, TOI-4759, TOI-5240, TOI-5467, and TOI-5882. They consist of 5 brown dwarf companions and 6 very low mass stellar companions ranging in mass from 25MJ to 128MJ. We used a combination of […]
Public
Martin Owens :inkscape:

This took a *long* time to get to me. It was hanging out at MIT during Covid and finally someone mailed it to me this year as the lab was being closed up.

It was a fun project to work on, though I wasn't critical. Best I can say is; "I hope I helped" 😅 But I'm also chuffed to bits to have it.

National Aeronautics and Space Administration Presents the Silver Achievement Medal to TESS Project Team The TESS team overcame many obstacles but through sheer force and determination was able to overcome them all, leading to a successful launch on April 18, 2018. Martin Owens Signed and Sealed at Washinton DC this twenty-eighth day in August Two Thousand Nineteen Signed by the Administrator of NASA There is a golden NASA seal embosed on the left-bottom side.
#TESS#NASA#Space
Public
michael

13-JUN-2024
Mysterious mini-Neptunes

This study discovered mini-Neptunes around four red dwarfs using observations from a global network of ground-based telescopes and the #TESS space telescope. These four mini-Neptunes are close to their parent stars, and the three of them are likely to be in eccentric orbits.

eurekalert.org/news-releases/1

EurekAlert!Mysterious mini-NeptunesThis study discovered mini-Neptunes around four red dwarfs using observations from a global network of ground-based telescopes and the TESS space telescope. These four mini-Neptunes are close to their parent stars, and the three of them are likely to be in eccentric orbits.
#science#astrobiology#exoplanets
Public
Daniel Fischer

Searching for Free-Floating Planets with #TESS - Discovery of a First Terrestrial-Mass Candidate: arxiv.org/abs/2404.11666 -> TESS Finds its First Rogue Planet: universetoday.com/166755/tess-

arXiv.orgSearching for Free-Floating Planets with TESS: I. Discovery of a First Terrestrial-Mass CandidateThough free-floating planets (FFPs) that have been ejected from their natal star systems may outpopulate their bound counterparts in the terrestrial-mass range, they remain one of the least explored exoplanet demographics. Due to their negligible electromagnetic emission at all wavelengths, the only observational technique able to detect these worlds is gravitational microlensing. Microlensing by terrestrial-mass FFPs induces rare, short-duration magnifications of background stars, requiring high-cadence, wide-field surveys to detect these events. The Transiting Exoplanet Survey Satellite (TESS), though designed to detect close-bound exoplanets via the transit technique, boasts a cadence as short as 200 seconds and has monitored hundreds of millions of stars, making it well-suited to search for short-duration microlensing events as well. We have used existing data products from the TESS Quick-Look Pipeline (QLP) to perform a preliminary search for FFP microlensing candidates in 1.3 million light curves from TESS Sector 61. We find one compelling candidate associated with TIC-107150013, a source star at $d_s = 3.194$ kpc. The event has a duration $t_E = 0.074^{+0.002}_{-0.002}$ days and shows prominent finite-source features ($ρ= 4.55^{+0.08}_{-0.07}$), making it consistent with an FFP in the terrestrial-mass range. This exciting result indicates that our ongoing search through all TESS sectors has the opportunity to shed new light on this enigmatic population of worlds.
Continued thread
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Bibiana Prinoth

They observed WASP-12 b 45 times with #CHEOPS and used #TESS and #Spitzer data to study the phase curve including tidal deformation.

Why is tidal deformation important? If you don’t account for the shape, you’ll overestimate the density of your planet.

The phase curves allow to calculate the Love number which should tell us about the core mass fraction. Sadly not very well constrained, so we need #JWST for that instead. They’ll be doing that for WASP-103 b.

#ExSSV
Replied in thread
Public
Bibiana Prinoth

We continue with David Ehrenreich on the v² Lupi system: a tale of three sub-Neptunian worlds in the evaporation valley.

Close-in sub-Neptune planets experience mass loss, also young ones and it could be the reason for the observed radius value. So there is a high interest in studying cooler longer period sub-Neptunes.

This leads to the synergy of CHEOPS and TESS 🙌🏻 #TESS finds, #CHEOPS follows up. #ExSSV

Public
Bibiana Prinoth

We’re back! — and in a food coma.

Samuel Yee takes us on a journey on the #TESS grand unified hot jupiter survey.

Hot Jupiters, though my favourites, are intrinsically rare. So statistics is difficult + most hot Jupiters have been detected from the ground which entails that there are differences between observations and “unified” is not a thing.

#ExSSV
Public
Mikko Tuomi

Astronomers have discovered two new hot Jupiter #exoplanets with #TESS.

The newfound worlds, designated TOI-4377 b and TOI-4551 b, both orbit distant red-giant #stars.

The #planets were found during a search for transits around red-giant branch stars observed by TESS in the southern ecliptic hemisphere.

The planets rare examples of giant alien worlds with short orbital periods, orbiting red giants.

#astronomy
phys.org/news/2023-11-astronom

Paper by Pereira et al. (2023):
academic.oup.com/mnras/advance

phys.orgAstronomers discover two 'hot Jupiters' orbiting red-giant starsUsing NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered two new "hot Jupiter" exoplanets. The newfound alien worlds, designated TOI-4377 b and TOI-4551 b, both orbit distant red-giant stars. The finding was reported November 8 in the Monthly Notices of the Royal Astronomical Society.
Continued thread
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Dr. Alexandre Santerne 🌍

5️⃣ So, the team wanted to understand the capabilities of #JWST to detect #exoplanet #atmosphere. But how does it work ?

When (if) a planet passes in front of its host star, it blocks some stellar light, which produce what we call "a #transit". The bigger the #planet is (relative to its host #star), the deeper the #transit is. We know several thousand transiting #exoplanets, most of them being discovered by the #Kepler and #TESS #space missions (#NASA) or by the #WASP survey on the #ground.

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