The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like
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| Format: | Preprint |
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2024
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| author | Brinkman, Casey L. Weiss, Lauren M. Huber, Daniel Lee, Rena A. Kolecki, Jared Tenn, Gwyneth Zhang, Jingwen Narayanan, Suchitra Polanski, Alex S. Dai, Fei Bean, Jacob L. Beard, Corey Brady, Madison Brodheim, Max Brown, Matt Deich, William Edelstein, Jerry Fulton, Benjamin J. Giacalone, Steven Gibson, Steven R. Gilbert, Gregory J. Halverson, Samuel Handley, Luke Hill, Grant M. Holcomb, Rae Holden, Bradford Householder, Aaron Howard, Andrew W. Isaacson, Howard Kaye, Stephen Laher, Russ R. Lanclos, Kyle Ong, J. M. Joel Payne, Joel Petigura, Eric A. Pidhorodetska, Daria Poppett, Claire Roy, Arpita Rubenzahl, Ryan Saunders, Nicholas Schwab, Christian Seifahrt, Andreas Shaum, Abby P. Sirk, Martin M. Smith, Chris Smith, Roger Stefánsson, Guðmundur Stürmer, Julian Thorne, Jim Turtelboom, Emma V. Tyler, Dakotah Valliant, John Van Zandt, Judah Walawender, Josh Yee, Samuel W. Yeh, Sherry Zink, Jon |
| author_facet | Brinkman, Casey L. Weiss, Lauren M. Huber, Daniel Lee, Rena A. Kolecki, Jared Tenn, Gwyneth Zhang, Jingwen Narayanan, Suchitra Polanski, Alex S. Dai, Fei Bean, Jacob L. Beard, Corey Brady, Madison Brodheim, Max Brown, Matt Deich, William Edelstein, Jerry Fulton, Benjamin J. Giacalone, Steven Gibson, Steven R. Gilbert, Gregory J. Halverson, Samuel Handley, Luke Hill, Grant M. Holcomb, Rae Holden, Bradford Householder, Aaron Howard, Andrew W. Isaacson, Howard Kaye, Stephen Laher, Russ R. Lanclos, Kyle Ong, J. M. Joel Payne, Joel Petigura, Eric A. Pidhorodetska, Daria Poppett, Claire Roy, Arpita Rubenzahl, Ryan Saunders, Nicholas Schwab, Christian Seifahrt, Andreas Shaum, Abby P. Sirk, Martin M. Smith, Chris Smith, Roger Stefánsson, Guðmundur Stürmer, Julian Thorne, Jim Turtelboom, Emma V. Tyler, Dakotah Valliant, John Van Zandt, Judah Walawender, Josh Yee, Samuel W. Yeh, Sherry Zink, Jon |
| contents | Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host gaseous envelopes. To test this diversity in composition, we update the masses of 5 rocky exoplanets (HD 93963 A b, Kepler-10 b, Kepler-100 b, Kepler-407 b, and TOI-1444 b) and present the confirmation of a new planet (TOI-1011) using 187 high precision RVs from Gemini/MAROON-X and Keck/KPF. Our updated planet masses suggest compositions closer to that of the Earth than previous literature values for all planets in our sample. In particular, we report that two previously identified ``super-Mercuries'' (Kepler-100 b and HD 93963 A b) have lower masses that suggest less iron-rich compositions. We then compare the ratio of iron to rock-building species to the abundance ratios of those elements in their host stars. These updated planet compositions do not suggest a steep relationship between planet and host star compositions, contradictory to previous results, and suggest that planets and host stars have similar abundance ratios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_00213 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like Brinkman, Casey L. Weiss, Lauren M. Huber, Daniel Lee, Rena A. Kolecki, Jared Tenn, Gwyneth Zhang, Jingwen Narayanan, Suchitra Polanski, Alex S. Dai, Fei Bean, Jacob L. Beard, Corey Brady, Madison Brodheim, Max Brown, Matt Deich, William Edelstein, Jerry Fulton, Benjamin J. Giacalone, Steven Gibson, Steven R. Gilbert, Gregory J. Halverson, Samuel Handley, Luke Hill, Grant M. Holcomb, Rae Holden, Bradford Householder, Aaron Howard, Andrew W. Isaacson, Howard Kaye, Stephen Laher, Russ R. Lanclos, Kyle Ong, J. M. Joel Payne, Joel Petigura, Eric A. Pidhorodetska, Daria Poppett, Claire Roy, Arpita Rubenzahl, Ryan Saunders, Nicholas Schwab, Christian Seifahrt, Andreas Shaum, Abby P. Sirk, Martin M. Smith, Chris Smith, Roger Stefánsson, Guðmundur Stürmer, Julian Thorne, Jim Turtelboom, Emma V. Tyler, Dakotah Valliant, John Van Zandt, Judah Walawender, Josh Yee, Samuel W. Yeh, Sherry Zink, Jon Earth and Planetary Astrophysics Solar and Stellar Astrophysics Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host gaseous envelopes. To test this diversity in composition, we update the masses of 5 rocky exoplanets (HD 93963 A b, Kepler-10 b, Kepler-100 b, Kepler-407 b, and TOI-1444 b) and present the confirmation of a new planet (TOI-1011) using 187 high precision RVs from Gemini/MAROON-X and Keck/KPF. Our updated planet masses suggest compositions closer to that of the Earth than previous literature values for all planets in our sample. In particular, we report that two previously identified ``super-Mercuries'' (Kepler-100 b and HD 93963 A b) have lower masses that suggest less iron-rich compositions. We then compare the ratio of iron to rock-building species to the abundance ratios of those elements in their host stars. These updated planet compositions do not suggest a steep relationship between planet and host star compositions, contradictory to previous results, and suggest that planets and host stars have similar abundance ratios. |
| title | The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.00213 |