TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf
Abstrak
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 ± 0.041 R _⊕ ) ultra-short-period (USP) planet orbiting a nearby (∼20 pc) M dwarf. Using the newly commissioned Keck Planet Finder spectrograph, we have measured the mass of TOI-6324 b 1.17 ± 0.22 M _⊕ . Because of its extremely short orbit of just ∼6.7 hr, 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% ± 37%) consistent with that of Earth (∼33%) and other confirmed USPs. TOI-6324 b is the closest to an 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 seven sectors of TESS data, we report a tentative detection of the optical phase-curve variation with an amplitude of 42 ± 28 ppm.
Topik & Kata Kunci
Penulis (74)
Rena A. Lee
Fei Dai
Andrew W. Howard
Samuel Halverson
Jonathan Gomez Barrientos
Michael Greklek-McKeon
Heather A. Knutson
Benjamin J. Fulton
Guđmundur Stefánsson
Jack Lubin
Howard Isaacson
Casey L. Brinkman
Nicholas Saunders
Daniel Hey
Daniel Huber
Lauren M. Weiss
Leslie A. Rogers
Diana Valencia
Mykhaylo Plotnykov
Kimberly Paragas
Renyu Hu
Te Han
Erik A. Petigura
Ryan Rubenzahl
David R. Ciardi
Aaron Householder
Gregory J. Gilbert
J. M. Joel Ong
Jingwen Zhang
Jacob Luhn
Luke Handley
Corey Beard
Steven Giacalone
Rae Holcomb
Judah Van Zandt
Ashley D. Baker
Max Brodheim
Matt Brown
David Charbonneau
Karen A. Collins
Ian J. M. Crossfield
William Deich
Xavier Dumusque
Steven R. Gibson
Emily Gilbert
Grant M. Hill
Bradford Holden
Jon M. Jenkins
Stephen Kaye
Russ R. Laher
Kyle Lanclos
W. Garett Levine
Joel Payne
Alex S. Polanski
John O’Meara
George R. Ricker
Kodi Rider
Paul Robertson
Arpita Roy
Joshua E. Schlieder
Christian Schwab
Sara Seager
Abby P. Shaum
Martin M. Sirk
Stephanie Striegel
Johanna Teske
John Valliant
Roland Vanderspek
Gautam Vasisht
Josh Walawender
Sharon Xuesong Wang
Joshua N. Winn
Edward Wishnow
Sherry Yeh
Akses Cepat
- Tahun Terbit
- 2025
- Sumber Database
- DOAJ
- DOI
- 10.3847/2041-8213/adadd7
- Akses
- Open Access ✓