TOI-2005b: An Eccentric Warm Jupiter in Spin-orbit Alignment
Abstract We report the discovery and characterization of TOI-2005 b, a warm Jupiter on an eccentric ( e ∼ 0.59), 17.3 days orbit around a V mag = 9.867 rapidly rotating F-star. The object was detected as a candidate by Transiting Exoplanet Survey Satellite and the planetary nature of TOI-2005 b was then confirmed via a series of ground-based photometric, spectroscopic, and diffraction-limited imaging observations. The planet was found to reside in a low sky-projected stellar obliquity orbit ( λ = <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>4</mml:mn> <mml:mo>.</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>8</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>2.5</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>2.3</mml:mn> </mml:mrow> </mml:msubsup> </mml:math> degrees) via a transit spectroscopic observation using the Magellan Magellan Inamori Kyocera Echelle spectrograph. TOI-2005 b is one of a few planets known to have a low-obliquity high-eccentricity orbit, which may be the result of high-eccentricity coplanar migration. The planet has a periastron equilibrium temperature of ∼2100 K, similar to some highly irradiated hot Jupiters where atomic metal species have been detected in transmission spectroscopy, and varies by almost 1000 K during its orbit. Future observations of the atmosphere of TOI-2005b can inform us about its radiative timescales thanks to the rapid heating and cooling of the planet.
Authors
- Samuel N. Quinn (ORCID: https://orcid.org/0000-0002-8964-8377)
- Thiam-Guan Tan (ORCID: https://orcid.org/0000-0001-5603-6895)
- Jon M. Jenkins (ORCID: https://orcid.org/0000-0002-4715-9460)
- Lyu Abe (ORCID: https://orcid.org/0000-0002-0856-4527)
- Jiayin Dong (ORCID: https://orcid.org/0000-0002-3610-6953)
- Cristilyn N. Watkins (ORCID: https://orcid.org/0000-0001-8621-6731)
- David W. Latham (ORCID: https://orcid.org/0000-0001-9911-7388)
- Rafael Brahm (ORCID: https://orcid.org/0000-0002-9158-7315)
- J. Villaseñor (ORCID: https://orcid.org/0000-0002-4625-8264)
- Karen A. Collins (ORCID: https://orcid.org/0000-0001-6588-9574)
- T. Guillot (ORCID: https://orcid.org/0000-0002-7188-8428)
- Zahra Essack (ORCID: https://orcid.org/0000-0002-2482-0180)
- A. H. M. J. Triaud (ORCID: https://orcid.org/0000-0002-5510-8751)
- Eric B. Ting (ORCID: https://orcid.org/0000-0002-8219-9505)
- Jack Schulte (ORCID: https://orcid.org/0000-0002-7382-0160)
- Sara Seager (ORCID: https://orcid.org/0000-0002-6892-6948)
- Richard P. Schwarz (ORCID: https://orcid.org/0000-0001-8227-1020)
- Olga Suárez (ORCID: https://orcid.org/0000-0002-3503-3617)
- K. Horne (ORCID: https://orcid.org/0000-0003-1728-0304)
- Andrew Vanderburg (ORCID: https://orcid.org/0000-0001-7246-5438)
- G. Ricker (ORCID: https://orcid.org/0000-0003-2058-6662)
- Knicole D. Colón (ORCID: https://orcid.org/0000-0001-8020-7121)
- Chelsea X. Huang (ORCID: https://orcid.org/0000-0003-0918-7484)
- Andrés Jordán (ORCID: https://orcid.org/0000-0002-5389-3944)
- D. J. Osip (ORCID: https://orcid.org/0000-0003-0412-9664)
- Carl Ziegler (ORCID: https://orcid.org/0000-0002-0619-7639)
- L. C. Mayorga (ORCID: https://orcid.org/0000-0002-4321-4581)
- Avi Shporer (ORCID: https://orcid.org/0000-0002-1836-3120)
- Y. Beletsky
- George Zhou (ORCID: https://orcid.org/0000-0002-4891-3517)
- Noah Vowell (ORCID: https://orcid.org/0000-0002-0701-4005)
- Jason D. Eastman (ORCID: https://orcid.org/0000-0003-3773-5142)
- Brad Carter (ORCID: https://orcid.org/0000-0003-0035-8769)
- Thomas Henning (ORCID: https://orcid.org/0000-0002-1493-300X)
- Joseph E. Rodriguez (ORCID: https://orcid.org/0000-0001-8812-0565)
- Mélissa J. Hobson (ORCID: https://orcid.org/0000-0002-5945-7975)
- Allyson Bieryla (ORCID: https://orcid.org/0000-0001-6637-5401)
- M. I. Jones
- Joshua N. Winn
Institutions
- Ames Research Center (US)
- Centre National de la Recherche Scientifique (FR)
- Goddard Space Flight Center (US)
- University of Illinois Urbana-Champaign (US)
- University of St Andrews (GB)
- University of New Mexico (US)
- University of Southern Queensland (AU)
- Princeton University (US)
- Stephen F. Austin State University (US)
- Adolfo Ibáñez University (CL)
- Johns Hopkins University Applied Physics Laboratory (US)
- Millennium Institute of Astrophysics (CL)
- Perth Exoplanet Survey Telescope Observatory (AU)
- Max Planck Institute for Astronomy (DE)
- Center for Astrophysics Harvard & Smithsonian (US)
- Observatoire de la Côte d’Azur (FR)
- European Southern Observatory (CL)
- Las Campanas Observatory (CL)
- Flatiron Health (United States) (US)
- Flatiron Institute (US)
- Data Observatory Foundation
- American Institute of Aeronautics and Astronautics (US)
- Massachusetts Institute of Technology (US)
- University of Birmingham (GB)
- Michigan State University (US)
Publication Details
- Journal
- The Astronomical Journal
- Published
- 2025-04-24
- DOI
- https://doi.org/10.3847/1538-3881/adc441
- Citations
- 4
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- National Science Foundation
- National Aeronautics and Space Administration
- Simons Foundation
- California Institute of Technology
- European Space Agency
- Flatiron Health
- European Commission
- Agence Nationale de la Recherche
- Ministry of Science, ICT and Future Planning
- Institut Polaire Français Paul Emile Victor
- Agencia Nacional de Investigación y Desarrollo
- Ames Research Center
- Science Mission Directorate
- Science and Technology Facilities Council