Terrestrial worlds with P<1 day, known as ultra-short period planets (USPs), comprise a physically distinct population whose origins may be attributed to various possible formation channels within multi-planet systems.
Kepler
![Relations between mutual inclination and stellar metallicity and stellar mass after sample control. Left: stellar metallicity vs. mutual inclination plot for a subsample of 78 systems selected to minimize the influence of stellar mass. Right: stellar mass vs. mutual inclination plot for a subsample of 81 systems selected to minimize the influence of stellar metallicity. Unlike [Fe/H] vs. ∆i, the correlation between stellar mass and ∆i is not statistically significant in our sample, although we cannot completely rule out such a correlation. See Section 5 for more details. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/02/Short-Period-Small-Planets.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
Short-Period Small Planets with High Mutual Inclinations are more Common around Metal-Rich Stars
We present a correlation between the stellar metallicities and the mutual inclinations of multi-planet systems hosting short-period small planets (a/Rs<12, Rp<4Re). We analyzed 89 multi-planet systems discovered by Kepler, K2, […]
Posted inExoplanets, -moons, -comets, Status Report
Background Exoplanet Candidates In The Original Kepler Field
Context. During the primary Kepler mission, between 2009 and 2013, about 150,000 pre-selected targets were observed with a 29.42 minute-long cadence. However, a survey of background stars that fall within […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
An Independent Search for Small Long-period Planets in Kepler Data I: Detection Pipeline
The unprecedented photometric precision of Kepler mission allows searching for Earth-like planets.
Posted inAstronomy & Telescopes, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Icy Worlds, Imaging & Spectroscopy, Press Release, Water/Hycean Worlds & Oceanography
Hubble Finds Water Vapour In The Atmosphere Of Small Exoplanet GJ 9827d
Astronomers using the NASA/ESA Hubble Space Telescope observed the smallest exoplanet where water vapour has been detected in its atmosphere. At only approximately twice Earth’s diameter, the planet GJ 9827d […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
Leveraging Precise Photometry From Kepler and TESS to Extract Exoplanets from Radial Velocity Time Series
Stellar activity contamination of radial velocity (RV) data is one of the top challenges plaguing the field of extreme precision RV (EPRV) science. Previous work has shown that photometry can […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Stellar Cartography
Stellar Cartography: Small And Close-In Planets Are Uncommon Around A-type Stars
The Kepler and K2 missions enabled robust calculations of planet occurrence rates around FGKM-type stars. However, these missions observed too few stars with earlier spectral types to tightly constrain the […]
Posted inAI - Data - Apps - Cybernetics, Astronomy & Telescopes, Exoplanets, -moons, -comets, Status Report
Planetary Mass Determinations from a Simplified Photodynamical Model — Application To The Complete Kepler Dataset
We use PyDynamicaLC, a model using the least number of, and the least correlated, degrees of freedom needed to derive a photodynamical model, to describe some of the smallest — […]
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report
A Fourth Planet In The Kepler-51 System Revealed By Transit Timing Variations
Kepler-51 is a ≲1 Gyr-old Sun-like star hosting three transiting planets with radii ≈6-9R⊕ and orbital periods ≈45-130 days. Transit timing variations (TTVs) measured with past Kepler and Hubble Space […]
Posted inExoplanets, -moons, -comets, Habitable Zones, Imaging & Spectroscopy, Magnetic Fields, Electromagnetism, bioelectricity,, Radiation, Space Weather & Heliophysics, Status Report
Magnetic Fields in a Sample of Planet-hosting M Dwarf Stars from Kepler, K2, and TESS Observed by APOGEE
Stellar magnetic fields have a major impact on space weather around exoplanets orbiting low-mass stars. From an analysis of Zeeman-broadened Fe I lines measured in near-infrared SDSS/APOGEE spectra, mean magnetic […]