TOI-2005b: an eccentric warm Jupiter in spin-orbit alignment

Allyson Bieryla; Jiayin Dong; George Zhou; Jason D. Eastman; L. C. Mayorga; David W. Latham; Brad Carter; Chelsea X. Huang; Samuel N. Quinn; Karen A. Collins; Lyu Abe; Yuri Beletsky; Rafael Brahm; Nicole D. Colón; Zahra Essack; Tristan Guillot; Thomas Henning; Melissa J. Hobson; Keith Horne; Jon M. Jenkins; Matías I. Jones; Andrés Jordán; David Osip; George R. Ricker; Joseph E. Rodriguez; Jack Schulte; Richard P. Schwarz; Sara Seager; Avi Shporer; Olga Suarez; Thiam-Guan Tan; Eric B. Ting; Amaury Triaud; Andrew Vanderburg; Jesus Noel Villanseñor; Noah Vowell; Christilyn N. Watkins; Joshua N. Winn; Carl Ziegler

doi:10.3847/1538-3881/adc441

TOI-2005b: an eccentric warm Jupiter in spin-orbit alignment

Allyson Bieryla^*, Jiayin Dong, George Zhou, Jason D. Eastman, L. C. Mayorga, David W. Latham, Brad Carter, Chelsea X. Huang, Samuel N. Quinn, Karen A. Collins, Lyu Abe, Yuri Beletsky, Rafael Brahm, Nicole D. Colón, Zahra Essack, Tristan Guillot, Thomas Henning, Melissa J. Hobson, Keith Horne, Jon M. JenkinsMatías I. Jones, Andrés Jordán, David Osip, George R. Ricker, Joseph E. Rodriguez, Jack Schulte, Richard P. Schwarz, Sara Seager, Avi Shporer, Olga Suarez, Thiam-Guan Tan, Eric B. Ting, Amaury Triaud, Andrew Vanderburg, Jesus Noel Villanseñor, Noah Vowell, Christilyn N. Watkins, Joshua N. Winn, Carl Ziegler

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 = 4.8^+2.3_-2.5 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 lowobliquity 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.

Original language	English
Article number	273
Number of pages	11
Journal	The Astronomical Journal
Volume	169
Issue number	5
Early online date	24 Apr 2025
DOIs	https://doi.org/10.3847/1538-3881/adc441
Publication status	Published - 1 May 2025

Keywords

Extrasolar gaseous giant planets (509)
Radial velocity (1332)
Transit photometry (1709)

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© 2025. The Author(s). Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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Bieryla, A., Dong, J., Zhou, G., Eastman, J. D., Mayorga, L. C., Latham, D. W., Carter, B., Huang, C. X., Quinn, S. N., Collins, K. A., Abe, L., Beletsky, Y., Brahm, R., Colón, N. D., Essack, Z., Guillot, T., Henning, T., Hobson, M. J., Horne, K., ... Ziegler, C. (2025). TOI-2005b: an eccentric warm Jupiter in spin-orbit alignment. The Astronomical Journal, 169(5), Article 273. https://doi.org/10.3847/1538-3881/adc441

@article{b00faf3aae9a40a4a9e62b11add9bc76,

title = "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 Vmag = 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 = 4.8+2.3-2.5 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 lowobliquity 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.",

keywords = "Extrasolar gaseous giant planets (509), Radial velocity (1332), Transit photometry (1709)",

author = "Allyson Bieryla and Jiayin Dong and George Zhou and Eastman, {Jason D.} and Mayorga, {L. C.} and Latham, {David W.} and Brad Carter and Huang, {Chelsea X.} and Quinn, {Samuel N.} and Collins, {Karen A.} and Lyu Abe and Yuri Beletsky and Rafael Brahm and Col{\'o}n, {Nicole D.} and Zahra Essack and Tristan Guillot and Thomas Henning and Hobson, {Melissa J.} and Keith Horne and Jenkins, {Jon M.} and Jones, {Mat{\'i}as I.} and Andr{\'e}s Jord{\'a}n and David Osip and Ricker, {George R.} and Rodriguez, {Joseph E.} and Jack Schulte and Schwarz, {Richard P.} and Sara Seager and Avi Shporer and Olga Suarez and Thiam-Guan Tan and Ting, {Eric B.} and Amaury Triaud and Andrew Vanderburg and Villanse{\~n}or, {Jesus Noel} and Noah Vowell and Watkins, {Christilyn N.} and Winn, {Joshua N.} and Carl Ziegler",

note = "Funding: C.H. thanks the support of the ARC DECRA program DE200101840 and Future Fellowship program FT240100016. G.Z. thanks the support of the ARC DECRA program DE210101893 and Future Fellowship program FT230100517. This research also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 803193/BEBOP) and from the Science and Technology Facilities Council (STFC; grant No. ST/S00193X/1). A.J. acknowledges support from ANID—Millennium Science Initiative—ICN12_009, AIM23-0001 and from FONDECYT project 1210718.",

year = "2025",

month = may,

day = "1",

doi = "10.3847/1538-3881/adc441",

language = "English",

volume = "169",

journal = "The Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "5",

}

Bieryla, A, Dong, J, Zhou, G, Eastman, JD, Mayorga, LC, Latham, DW, Carter, B, Huang, CX, Quinn, SN, Collins, KA, Abe, L, Beletsky, Y, Brahm, R, Colón, ND, Essack, Z, Guillot, T, Henning, T, Hobson, MJ, Horne, K, Jenkins, JM, Jones, MI, Jordán, A, Osip, D, Ricker, GR, Rodriguez, JE, Schulte, J, Schwarz, RP, Seager, S, Shporer, A, Suarez, O, Tan, T-G, Ting, EB, Triaud, A, Vanderburg, A, Villanseñor, JN, Vowell, N, Watkins, CN, Winn, JN & Ziegler, C 2025, 'TOI-2005b: an eccentric warm Jupiter in spin-orbit alignment', The Astronomical Journal, vol. 169, no. 5, 273. https://doi.org/10.3847/1538-3881/adc441

TY - JOUR

T1 - TOI-2005b

T2 - an eccentric warm Jupiter in spin-orbit alignment

AU - Bieryla, Allyson

AU - Dong, Jiayin

AU - Zhou, George

AU - Eastman, Jason D.

AU - Mayorga, L. C.

AU - Latham, David W.

AU - Carter, Brad

AU - Huang, Chelsea X.

AU - Quinn, Samuel N.

AU - Collins, Karen A.

AU - Abe, Lyu

AU - Beletsky, Yuri

AU - Brahm, Rafael

AU - Colón, Nicole D.

AU - Essack, Zahra

AU - Guillot, Tristan

AU - Henning, Thomas

AU - Hobson, Melissa J.

AU - Horne, Keith

AU - Jenkins, Jon M.

AU - Jones, Matías I.

AU - Jordán, Andrés

AU - Osip, David

AU - Ricker, George R.

AU - Rodriguez, Joseph E.

AU - Schulte, Jack

AU - Schwarz, Richard P.

AU - Seager, Sara

AU - Shporer, Avi

AU - Suarez, Olga

AU - Tan, Thiam-Guan

AU - Ting, Eric B.

AU - Triaud, Amaury

AU - Vanderburg, Andrew

AU - Villanseñor, Jesus Noel

AU - Vowell, Noah

AU - Watkins, Christilyn N.

AU - Winn, Joshua N.

AU - Ziegler, Carl

N1 - Funding: C.H. thanks the support of the ARC DECRA program DE200101840 and Future Fellowship program FT240100016. G.Z. thanks the support of the ARC DECRA program DE210101893 and Future Fellowship program FT230100517. This research also received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 803193/BEBOP) and from the Science and Technology Facilities Council (STFC; grant No. ST/S00193X/1). A.J. acknowledges support from ANID—Millennium Science Initiative—ICN12_009, AIM23-0001 and from FONDECYT project 1210718.

PY - 2025/5/1

Y1 - 2025/5/1

N2 - 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 Vmag = 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 = 4.8+2.3-2.5 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 lowobliquity 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.

AB - 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 Vmag = 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 = 4.8+2.3-2.5 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 lowobliquity 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.

KW - Extrasolar gaseous giant planets (509)

KW - Radial velocity (1332)

KW - Transit photometry (1709)

U2 - 10.3847/1538-3881/adc441

DO - 10.3847/1538-3881/adc441

M3 - Article

SN - 0004-6256

VL - 169

JO - The Astronomical Journal

JF - The Astronomical Journal

IS - 5

M1 - 273

ER -

TOI-2005b: an eccentric warm Jupiter in spin-orbit alignment

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