학술논문
The TESS-Keck Survey. XII. A Dense 1.8 R$_\oplus$ Ultra-Short-Period Planet Possibly Clinging to a High-Mean-Molecular-Weight Atmosphere After the First Gyr
Document Type
Working Paper
Author
Rubenzahl, Ryan A.; Dai, Fei; Howard, Andrew W.; Lissauer, Jack J.; Van Zandt, Judah; Beard, Corey; Giacalone, Steven; Murphy, Joseph M. Akana; Chontos, Ashley; Lubin, Jack; Brinkman, Casey; Tyler, Dakotah; MacDougall, Mason G.; Rice, Malena; Dalba, Paul A.; Mayo, Andrew W.; Weiss, Lauren M.; Polanski, Alex S.; Blunt, Sarah; Yee, Samuel W.; Hill, Michelle L.; Angelo, Isabel; Turtelboom, Emma V.; Holcomb, Rae; Behmard, Aida; Pidhorodetska, Daria; Batahla, Natalie M.; Crossfield, Ian J. M.; Dressing, Courtney; Fulton, Benjamin; Huber, Daniel; Isaacson, Howard; Kane, Stephen R.; Petigura, Erik A.; Robertson, Paul; Scarsdale, Nicholas; Mocnik, Teo; Fetherolf, Tara; Malavolta, Luca; Mortier, Annelies; Fiorenzano, Aldo; Pedani, Marco
Source
Subject
Language
Abstract
The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres. We present the confirmation and characterization of the USP TOI-1347 b, a $1.8 \pm 0.1$ R$_\oplus$ planet on a 0.85 day orbit that was detected with photometry from the TESS mission. We measured radial velocities of the TOI-1347 system using Keck/HIRES and HARPS-N and found the USP to be unusually massive at $11.1 \pm 1.2$ M$_\oplus$. The measured mass and radius of TOI-1347 b imply an Earth-like bulk composition. A thin H/He envelope (>0.01% by mass) can be ruled out at high confidence. The system is between 1 and 1.8 Gyr old; therefore, intensive photoevaporation should have concluded. We detected a tentative phase curve variation (3$\sigma$) and a secondary eclipse (2$\sigma$) in TESS photometry, which if confirmed could indicate the presence of a high-mean-molecular-weight atmosphere. We recommend additional optical and infrared observations to confirm the presence of an atmosphere and investigate its composition.
Comment: 22 pages, 9 figures, accepted for publication in The Astronomical Journal
Comment: 22 pages, 9 figures, accepted for publication in The Astronomical Journal