transiting Archives

Instellation flux as a function of planet escape velocity, in log-log scale. Based on data from the NASA Exoplanet Archive (2024) downloaded on June 30, 2024. The empirical “cosmic shoreline” and the water vapor greenhouse runaway threshold (Zahnle & Catling 2017) are shown as cyan and yellow shaded regions, respectively. Planets are categorized into terrestrial planets (magenta), sub-Neptunes (blue), Neptune-like planets (green), and gas giants (yellow) based on radius, see legend. The red rectangles represent escape velocities calculated based on HD 101581 planets’ mean estimated masses assuming Hypatia Catalog metallicity. Because only radius, but not mass, is known, we further plot light red regions covering all possible interior compositions, ranging from pure iron to pure silicates. Height of the rectangles represent uncertainties in insolation. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581

by Keith CowingDecember 13, 2024December 13, 2024

We report the validation of multiple planets transiting the nearby (d=12.8 pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481).

Variable absorptions in the 2740 Å Fe ii line. The black line shows the reference comet-free spectrum of β Pic, obtained by averaging the unabsorbed spectra at each individual wavelength. The deep and narrow absorption near 0 km/s is due to the stable component of the circumstellar disc of β Pic, which could be slightly blueshifted compared to the stellar radial velocity (see Brandeker (2011)).-- astro-ph.EP

Astrochemistry, Astrogeology, Astronomy & Telescopes, Comets and Asteroids, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Curves Of Growth For Transiting Exocomets: Application To Fe II Lines In The Beta Pictoris System

by Keith CowingFebruary 16, 2024

This study introduces the exocomet curve of growth, a new method to analyse the variable absorptions observed in β Pictoris spectrum and link them to the physical properties of the […]

transiting

Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581

Curves Of Growth For Transiting Exocomets: Application To Fe II Lines In The Beta Pictoris System

Opportunity to Contribute to NASA DARES Community White Paper on Phototrophic Biosignatures

NASA Establishes Mars Forward Operational Risk and Contamination Evaluation (M-FORCE) Tiger Team to Shape Mars Planetary Protection Protocols

Miraflores Butte On Mars

Ocean World Exploration: 2026 American Samoa ROV + Mapping Exploration

Development Of An Adaptive Optics Testbed At MPIA For The ELT/Planetary Camera And Spectrograph (PCS)