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Unravelling the origin of ultra-short period exoplanets: Discovery of a dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star

Lam, Kristine W. F. (2022) Unravelling the origin of ultra-short period exoplanets: Discovery of a dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star. 10th Joint Workshop on High Pressure, Planetary and Plasma Physics (HP4), Brussels, Belgium.

Full text not available from this repository.

Abstract

Ultrashort-period (USP) exoplanets have orbital periods shorter than 1 day and they typically have rocky compositions. Precise masses and radii of USP exoplanets could provide constraints on their unknown formation and evolution processes. We report the detection and characterization of the USP planet GJ 367b (1), using high-precision photometry and radial velocity observations. GJ 367b orbits a bright (V-band magnitude of 10.2), nearby, and red (M-type) dwarf star every 7.7 hours. GJ 367b has a radius of 0.718 ± 0.054 Earth-radii and a mass of 0.546 ± 0.078 Earth-masses, making it a sub-Earth planet. The corresponding bulk density is 8.106 ± 2.165 grams per cubic centimeter -- close to that of iron. An interior structure model predicts that the planet has an iron core radius fraction of 86 ± 5 %, similar to that of Mercury’s interior. In this talk, I will also discuss the what we can learn from exoplanet bulk interior compositions and some implications for their formation and evolution.

Item URL in elib:https://elib.dlr.de/190487/
Document Type:Conference or Workshop Item (Speech)
Title:Unravelling the origin of ultra-short period exoplanets: Discovery of a dense, ultrashort-period sub-Earth planet transiting a nearby red dwarf star
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lam, Kristine W. F.kristine.lam (at) dlr.deUNSPECIFIED
Date:2022
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Astronomy, planetary science, exoplanets
Event Title:10th Joint Workshop on High Pressure, Planetary and Plasma Physics (HP4)
Event Location:Brussels, Belgium
Event Type:international Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project PLATO - PMC and Science
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Deposited By: Lam, Wai Fun
Deposited On:21 Nov 2022 14:50
Last Modified:21 Nov 2022 14:50

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