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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2502.16087 |
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| author | Lee, Rena A. Dai, Fei Howard, Andrew W. Halverson, Samuel Barrientos, Jonathan Gomez Greklek-McKeon, Michael Knutson, Heather A. Fulton, Benjamin J. Stefánsson, Guðmundur Lubin, Jack Isaacson, Howard Brinkman, Casey L. Saunders, Nicholas Hey, Daniel Huber, Daniel Weiss, Lauren M. Rogers, Leslie A. Valencia, Diana Plotnykov, Mykhaylo Paragas, Kimberly Hu, Renyu Han, Te Petigura, Erik A. Rubenzahl, Ryan Ciardi, David R. Householder, Aaron Gilbert, Gregory J. Ong, J. M. Joel Zhang, Jingwen Luhn, Jacob Handley, Luke Beard, Corey Giacalone, Steven Holcomb, Rae Van Zandt, Judah Baker, Ashley D. Brodheim, Max Brown, Matt Charbonneau, David Collins, Karen A. Crossfield, Ian J. M. Deich, William Dumusque, Xavier Gibson, Steven R. Gilbert, Emily Hill, Grant M. Holden, Bradford Jenkins, Jon M. Kaye, Stephen Laher, Russ R. Lanclos, Kyle Levine, W. Garrett Payne, Joel Polanski, Alex S. O'Meara, John Ricker, George R. Rider, Kodi Robertson, Paul Roy, Arpita Schlieder, Joshua E. Schwab, Christian Seager, Sara Shaum, Abby P. Sirk, Martin M. Striegel, Stephanie Teske, Johanna Valliant, John Vanderspek, Roland Vasisht, Gautam Walawender, Josh Wang, Sharon Xuesong Winn, Joshua N. Wishnow, Edward Yeh, Sherry |
| author_facet | Lee, Rena A. Dai, Fei Howard, Andrew W. Halverson, Samuel Barrientos, Jonathan Gomez Greklek-McKeon, Michael Knutson, Heather A. Fulton, Benjamin J. Stefánsson, Guðmundur Lubin, Jack Isaacson, Howard Brinkman, Casey L. Saunders, Nicholas Hey, Daniel Huber, Daniel Weiss, Lauren M. Rogers, Leslie A. Valencia, Diana Plotnykov, Mykhaylo Paragas, Kimberly Hu, Renyu Han, Te Petigura, Erik A. Rubenzahl, Ryan Ciardi, David R. Householder, Aaron Gilbert, Gregory J. Ong, J. M. Joel Zhang, Jingwen Luhn, Jacob Handley, Luke Beard, Corey Giacalone, Steven Holcomb, Rae Van Zandt, Judah Baker, Ashley D. Brodheim, Max Brown, Matt Charbonneau, David Collins, Karen A. Crossfield, Ian J. M. Deich, William Dumusque, Xavier Gibson, Steven R. Gilbert, Emily Hill, Grant M. Holden, Bradford Jenkins, Jon M. Kaye, Stephen Laher, Russ R. Lanclos, Kyle Levine, W. Garrett Payne, Joel Polanski, Alex S. O'Meara, John Ricker, George R. Rider, Kodi Robertson, Paul Roy, Arpita Schlieder, Joshua E. Schwab, Christian Seager, Sara Shaum, Abby P. Sirk, Martin M. Striegel, Stephanie Teske, Johanna Valliant, John Vanderspek, Roland Vasisht, Gautam Walawender, Josh Wang, Sharon Xuesong Winn, Joshua N. Wishnow, Edward Yeh, Sherry |
| contents | We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $\pm$ 0.041 R$_\oplus$) ultra-short-period (USP) planet orbiting a nearby ($\sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, we have measured the mass of TOI-6324 b 1.17 $\pm$ 0.22 M$_\oplus$. Because of its extremely short orbit of just $\sim$6.7 hours, TOI-6324 b is intensely irradiated by its M dwarf host, and is expected to be stripped of any thick, H/He envelope. We were able to constrain its interior composition and found an iron core mass fraction (CMF = 27$\pm$37%) consistent with that of Earth ($\sim$33%) and other confirmed USPs. TOI-6324 b is the closest to Earth-sized USP confirmed to date. TOI-6324 b is a promising target for JWST phase curve and secondary eclipse observations (Emission Spectroscopy Metric = 25) which may reveal its surface mineralogy, day-night temperature contrast, and possible tidal deformation. From 7 sectors of TESS data, we report a tentative detection of the optical phase curve variation with an amplitude of 42$\pm$28 ppm. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_16087 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf Lee, Rena A. Dai, Fei Howard, Andrew W. Halverson, Samuel Barrientos, Jonathan Gomez Greklek-McKeon, Michael Knutson, Heather A. Fulton, Benjamin J. Stefánsson, Guðmundur Lubin, Jack Isaacson, Howard Brinkman, Casey L. Saunders, Nicholas Hey, Daniel Huber, Daniel Weiss, Lauren M. Rogers, Leslie A. Valencia, Diana Plotnykov, Mykhaylo Paragas, Kimberly Hu, Renyu Han, Te Petigura, Erik A. Rubenzahl, Ryan Ciardi, David R. Householder, Aaron Gilbert, Gregory J. Ong, J. M. Joel Zhang, Jingwen Luhn, Jacob Handley, Luke Beard, Corey Giacalone, Steven Holcomb, Rae Van Zandt, Judah Baker, Ashley D. Brodheim, Max Brown, Matt Charbonneau, David Collins, Karen A. Crossfield, Ian J. M. Deich, William Dumusque, Xavier Gibson, Steven R. Gilbert, Emily Hill, Grant M. Holden, Bradford Jenkins, Jon M. Kaye, Stephen Laher, Russ R. Lanclos, Kyle Levine, W. Garrett Payne, Joel Polanski, Alex S. O'Meara, John Ricker, George R. Rider, Kodi Robertson, Paul Roy, Arpita Schlieder, Joshua E. Schwab, Christian Seager, Sara Shaum, Abby P. Sirk, Martin M. Striegel, Stephanie Teske, Johanna Valliant, John Vanderspek, Roland Vasisht, Gautam Walawender, Josh Wang, Sharon Xuesong Winn, Joshua N. Wishnow, Edward Yeh, Sherry Earth and Planetary Astrophysics We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $\pm$ 0.041 R$_\oplus$) ultra-short-period (USP) planet orbiting a nearby ($\sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, we have measured the mass of TOI-6324 b 1.17 $\pm$ 0.22 M$_\oplus$. Because of its extremely short orbit of just $\sim$6.7 hours, TOI-6324 b is intensely irradiated by its M dwarf host, and is expected to be stripped of any thick, H/He envelope. We were able to constrain its interior composition and found an iron core mass fraction (CMF = 27$\pm$37%) consistent with that of Earth ($\sim$33%) and other confirmed USPs. TOI-6324 b is the closest to Earth-sized USP confirmed to date. TOI-6324 b is a promising target for JWST phase curve and secondary eclipse observations (Emission Spectroscopy Metric = 25) which may reveal its surface mineralogy, day-night temperature contrast, and possible tidal deformation. From 7 sectors of TESS data, we report a tentative detection of the optical phase curve variation with an amplitude of 42$\pm$28 ppm. |
| title | TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2502.16087 |