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KELT-23Ab: A Hot Jupiter Transiting a Near-solar Twin Close to the TESS and JWST Continuous Viewing Zones

Authors :
Steven Villanueva
Steve Rau
David W. Latham
Thomas E. Oberst
John F. Kielkopf
Jennifer L. Marshall
Paul Benni
Lea A. Hirsch
Eric L. N. Jensen
Ivan A. Curtis
Samuel N. Quinn
Michael B. Lund
Chris Stockdale
Mark Manner
David R. Ciardi
Joseph E. Rodriguez
Gabriel Murawski
Allyson Bieryla
Kim K. McLeod
Franky Dubois
Thiam-Guan Tan
Daniel Bayliss
Mark Trueblood
Knicole D. Colón
David H. Cohen
Joshua Pepper
Catherine P. Stevens
Kaloyan Penev
Joao Gregorio
Ludwig Logie
Jason D. Eastman
Karen A. Collins
Siegfried Vanaverbeke
D. L. DePoy
Roberto Zambelli
B. Scott Gaudi
Benjamin J. Fulton
Phillip A. Reed
Matthew T. Penny
Marshall C. Johnson
Thomas G. Beatty
Robert J. Siverd
David James
Rudolf B. Kuhn
Somayeh Khakpash
Daniel J. Stevens
David Kasper
Michael D. Joner
Denise C. Stephens
Pat Trueblood
Howard M. Relles
Keivan G. Stassun
Daniel Johns
Phil Evans
Jonathan Labadie-Bartz
Xinyu Yao
Ryan F. Rauenzahn
Robert A. Wittenmyer
Source :
The Astronomical Journal. 158:78
Publication Year :
2019
Publisher :
American Astronomical Society, 2019.

Abstract

We announce the discovery of KELT-23Ab, a hot Jupiter transiting the relatively bright ($V=10.3$) star BD+66 911 (TYC 4187-996-1), and characterize the system using follow-up photometry and spectroscopy. A global fit to the system yields host-star properties of $T_{eff}=5900\pm49 K$, $M_*=0.945^{+0.060}_{-0.054} M_{\odot}$, $R_*=0.995\pm0.015 R_{\odot}$, $L_*=1.082^{+0.051}_{-0.048} L_{\odot}$, log$g_{*}=4.418^{+0.026}_{-0.025}$ (cgs), and $\left[{\rm Fe}/{\rm H}\right]=-0.105\pm0.077$. KELT-23Ab is a hot Jupiter with mass $M_P=0.938^{+0.045}_{-0.042} M_{\rm J}$, radius $R_P=1.322\pm0.025 R_{\rm J}$, and density $\rho_P=0.504^{+0.038}_{-0.035}$ g cm$^{-3}$. Intense insolation flux from the star has likely caused KELT-23Ab to become inflated. The time of inferior conjunction is $T_0=2458149.40776\pm0.00091~\rm {BJD_{TDB}}$ and the orbital period is $P=2.255353^{+0.000031}_{-0.000030}$ days. There is strong evidence that KELT-23A is a member of a long-period binary star system with a less luminous companion, and due to tidal interactions, the planet is likely to spiral into its host within roughly a Gyr. This system has one of the highest positive ecliptic latitudes of all transiting planet hosts known to date, placing it near the Transiting Planet Survey Satellite and James Webb Space Telescope continuous viewing zones. Thus we expect it to be an excellent candidate for long-term monitoring and follow-up with these facilities.<br />Comment: 17 pages, 10 figures, Accepted for publication in AJ

Details

ISSN :
15383881
Volume :
158
Database :
OpenAIRE
Journal :
The Astronomical Journal
Accession number :
edsair.doi.dedup.....53af79663622c1e11acb7e3f8200b06e