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
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2024
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| 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 |
| author_facet | 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 |
| contents | 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$σ$) and a secondary eclipse (2$σ$) 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07451 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | 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 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 Earth and Planetary Astrophysics 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$σ$) and a secondary eclipse (2$σ$) 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. |
| title | 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 |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2402.07451 |