[Astronomy & Astrophysics] Close-in substellar companions experience strong tidal and magnetic interactions with their host stars and are therefore subject to fast orbital evolution.
TESS
Posted inExoplanets, -moons, -comets
Astro-Hunters: Machine Learning For Exoplanet Transit Detection In TESS Photometry
[astro-ph.EP] Finding planets beyond the Solar System is now largely a data-analysis problem: photometric surveys return far more stellar light curves than can be inspected by eye, and machine learning […]
Posted inAtmospheres, Climate, Weather
A Search for Helium in the Atmospheres of Three Sub-Neptunes and a Super-Earth Around M-dwarfs
[astro-ph.EP] Thousands of sub-Neptunes have been discovered mainly through space-based surveys such as Kepler and TESS. Their bulk compositions and internal structures are thought to reflect their formation and evolutionary […]
![Chemical abundance distributions of the Sample II planet-candidate host stars in the [Fe/H]–[Mg/Fe] plane.](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/A-chemo.png?resize=1200%2C715&ssl=1)
Posted inStellar Cartography
A Chemo-dynamical Search For Planet-candidate Hosts Of Possible Extragalactic Origin
[astro-ph.SR] To date, all known exoplanetary systems have been identified around stars currently residing in the Milky Way, whereas planets formed in external galaxies remain largely unexplored. Such systems would […]
![CH Ind timing and inference. Top: the six differential nodes 𝐷 from equation (1); subtracting primary and secondary O–C values removes their common ephemeris or LTTE trend and isolates the first-order apsidal signal. Bottom: Monte Carlo posteriors for the displayed 0.08-dex common log 𝑘2 systematic; horizontal segments show central 68 per cent intervals.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Stellar-Tidal.png?resize=1200%2C718&ssl=1)
Posted inStellar Cartography
Stellar Tidal Systematics In Apsidal-motion Searches For Circumbinary Planets: CH Ind And SW CMa
[astro-ph.EP] Thornton et al. (2026) reported 27 non-transiting circumbinary-planet candidates from excess apsidal motion in TESS eclipsing-binary timings. The classical stellar contribution is sensitive to target-specific radii, apsidal constants k2, […]
![Left: Sensitivity of TESS to transits in the full sample of single-star TOIs. Center: The sensitivity for all binary stars in our sample, with all planets presumed to transit the brighter star. Right: As with the top-center panel, except that all planets are assumed to transit the fainter star. The sensitivity of TESS to small planets around binary hosts is substantially lower than for single-star hosts, especially when the planet transits the secondary star.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/The-sensitivity.png?resize=1200%2C722&ssl=1)
Posted inExoplanets, -moons, -comets
The Sensitivity Of TESS To Transiting Planets In TOIs With Close-in Stellar Companions
[astro-ph.EP] High resolution imaging with optical speckle interferometry has revealed that many transiting exoplanet host stars possess close-in stellar companions.
![Monte Carlo period simulations for each target. The v sin i values derived from species are used for randomly oriented (sinusoidally distributed) axial inclinations (green) and for a fixed i = 90o (light grey). The respective curves using the M16 v sin i estimates are also shown (orange and dark grey). The modal periods, Pˆ, are shown for each distribution. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Three-new.png?resize=1200%2C622&ssl=1)
Posted inExoplanets, -moons, -comets
Three New Exoplanet Systems From The Dispersed Matter Planet Project
[astro-ph.EP] We present a radial velocity analysis of three bright, low-activity stars identified by the Dispersed Matter Planet Project (DMPP).
![The mass-radius-period parameter spaces for short-period exoplanets. In (a), the radii and orbital periods of known planets are shown with systems coloured by the stellar effective temperature. The TASSIE II TOIs are highlighted as points with 3σ error bars for their radii. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/The-TASSIE-Program.png?resize=1200%2C719&ssl=1)
Posted inExoplanets, -moons, -comets
The TASSIE Program. II: Three Close-In Companions Orbiting Sun-Like Stars
[astro-ph.EP] We present three southern transiting giant planet candidates alerted by the Transiting Exoplanet Survey Satellite (TESS) mission and investigated at the University of Tasmania Greenhill Observatory (UTGO).
Posted inStellar Cartography
TESS Photometry and Radial Velocity Analysis of the sub-Neptune Exoplanet π Mensae c and the Wider π Mensae Planetary System
[astro-ph.EP] Exoplanet characterization relies on precise measurements of planetary orbital and physical parameters. This is particularly important for planetary dynamics and atmospheric evolution, as orbital parameters help constrain system evolution, […]
Posted inHabitable Zones
The Expected Yield Of Venus Zone Terrestrial Planets From PLATO
[astro-ph.EP] The characterization of terrestrial exoplanets and the conditions that lead to divergent climate outcomes is a primary goal of exoplanetary science.