HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
Abstract
Transiting Warm Jupiters orbiting bright stars are scarcely known, but a substantial number of these planets have been uncovered by the TESS mission. In this work we report the discovery and confirmation of a transiting Warm Jupiter orbiting the bright (V = 8.70) subgiant star HD 715 (TOI-6893). HD 715 b was originally identified from a single transit event in TESS Sector 70. We acquired two seasons of radial velocity follow-up using the PFS, TRES, and MINERVA-Australis spectrographs, which clearly detect the planetary orbit. At M*=1.60±0.04 M⊙, HD 715 thus becomes one of the most massive stars known to host a transiting Warm Jupiter. From a joint fit to the TESS transit and our RVs, we find that HD 715 b has a 56.40+0.19−0.23 day orbital period and measure a precise mass and radius of 0.635±0.056 MJ and 1.07±0.04 RJ, rendering it a relatively typical member of the Warm Jupiter population. The moderate orbital eccentricity of 0.21+0.07−0.08 contrasts with the higher eccentricities of other similar Warm Jupiters orbiting evolved stars, indicating a greater diversity in orbital eccentricities than previously known. The absence of additional transits in preceding TESS observations in Sectors 42 and 43 allows us to further refine the range of possible orbital periods to $[56.01, 56.35]$ days. Though the ephemeris uncertainty remains substantial, future photometric observations may nonetheless allow for recovery of the transit of HD 715 b.
Versions
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BibTeX
@misc{venner2026warm,
title = {{HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit}},
author = {Alexander Venner and Robert A. Wittenmyer and Andrew Vanderburg and Karen A. Collins and David W. Latham and Allyson Bieryla and Tyler R. Fairnington and Chelsea X. Huang and Timothy R. Bedding and Samuel Grunblatt and Sydney Jenkins and R. Paul Butler and Jeffrey D. Crane and Jhon Yana Galarza and Jonathan Horner and Steve B. Howell and Marc Huten and Stephen R. Kane and David Osip and Marcelo Said Tala Pinto and Samuel N. Quinn and Johanna Teske and Steve Shectman and Shreyas Vissapragada and Duncan Wright and George Zhou},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08065},
eprint = {2610.08065},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.08065},
}
RIS
TY - UNPB
TI - HD 715 b, a Warm Jupiter Orbiting a Massive Subgiant Discovered from a Single TESS Transit
AU - Alexander Venner
AU - Robert A. Wittenmyer
AU - Andrew Vanderburg
AU - Karen A. Collins
AU - David W. Latham
AU - Allyson Bieryla
AU - Tyler R. Fairnington
AU - Chelsea X. Huang
AU - Timothy R. Bedding
AU - Samuel Grunblatt
AU - Sydney Jenkins
AU - R. Paul Butler
AU - Jeffrey D. Crane
AU - Jhon Yana Galarza
AU - Jonathan Horner
AU - Steve B. Howell
AU - Marc Huten
AU - Stephen R. Kane
AU - David Osip
AU - Marcelo Said Tala Pinto
AU - Samuel N. Quinn
AU - Johanna Teske
AU - Steve Shectman
AU - Shreyas Vissapragada
AU - Duncan Wright
AU - George Zhou
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2610.08065
UR - https://arxiv.org/abs/2610.08065
AB - Transiting Warm Jupiters orbiting bright stars are scarcely known, but a substantial number of these planets have been uncovered by the TESS mission. In this work we report the discovery and confirmation of a transiting Warm Jupiter orbiting the bright (V = 8.70) subgiant star HD 715 (TOI-6893). HD 715 b was originally identified from a single transit event in TESS Sector 70. We acquired two seasons of radial velocity follow-up using the PFS, TRES, and MINERVA-Australis spectrographs, which clearly detect the planetary orbit. At M_*=1.60±0.04 M_⊙, HD 715 thus becomes one of the most massive stars known to host a transiting Warm Jupiter. From a joint fit to the TESS transit and our RVs, we find that HD 715 b has a 56.40^+0.19_−0.23 day orbital period and measure a precise mass and radius of 0.635±0.056 M_J and 1.07±0.04 R_J, rendering it a relatively typical member of the Warm Jupiter population. The moderate orbital eccentricity of 0.21^+0.07_−0.08 contrasts with the higher eccentricities of other similar Warm Jupiters orbiting evolved stars, indicating a greater diversity in orbital eccentricities than previously known. The absence of additional transits in preceding TESS observations in Sectors 42 and 43 allows us to further refine the range of possible orbital periods to $[56.01, 56.35]$ days. Though the ephemeris uncertainty remains substantial, future photometric observations may nonetheless allow for recovery of the transit of HD 715 b.
ER -