TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant

Robert A. Wittenmyer; Jake T. Clark; Trifon Trifonov; Brett C. Addison; Duncan J. Wright; Keivan G. Stassun; Jonathan Horner; Nataliea Lowson; John Kielkopf; Stephen R. Kane; Peter Plavchan; Avi Shporer; Hui Zhang; Brendan P. Bowler; Matthew W. Mengel; Jack Okumura; Markus Rabus; Marshall C. Johnson; Daniel Harbeck; René Tronsgaard; Lars A. Buchhave; Karen A. Collins; Kevin I. Collins; Tianjun Gan; Eric L. N. Jensen; Steve B. Howell; E. Furlan; Crystal L. Gnilka; Kathryn V. Lester; Rachel A. Matson; Nicholas J. Scott; George R. Ricker; Roland Vanderspek; David W. Latham; S. Seager; Joshua N. Winn; Jon M. Jenkins; Alexander Rudat; Elisa V. Quintana; David R. Rodriguez; Douglas A. Caldwell; Samuel N. Quinn; Zahra Essack; Luke G. Bouma

doi:10.3847/1538-3881/ac3f39

TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant

Robert A. Wittenmyer^*, Jake T. Clark, Trifon Trifonov, Brett C. Addison, Duncan J. Wright, Keivan G. Stassun, Jonathan Horner, Nataliea Lowson, John Kielkopf, Stephen R. Kane, Peter Plavchan, Avi Shporer, Hui Zhang, Brendan P. Bowler, Matthew W. Mengel, Jack Okumura, Markus Rabus, Marshall C. Johnson, Daniel Harbeck, René TronsgaardLars A. Buchhave, Karen A. Collins, Kevin I. Collins, Tianjun Gan, Eric L. N. Jensen, Steve B. Howell, E. Furlan, Crystal L. Gnilka, Kathryn V. Lester, Rachel A. Matson, Nicholas J. Scott, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Alexander Rudat, Elisa V. Quintana, David R. Rodriguez, Douglas A. Caldwell, Samuel N. Quinn, Zahra Essack, Luke G. Bouma

^*Corresponding author for this work

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Abstract

The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of R_J, a mass of M_J, an orbital period of days, and an extremely low density (ρ = 0.252 ± 0.091 g cm⁻³). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterization. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hr also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterization.

Original language	English
Article number	82
Journal	Astronomical Journal
Volume	163
Issue number	2
Number of pages	15
ISSN	0004-6256
DOIs	https://doi.org/10.3847/1538-3881/ac3f39
Publication status	Published - 2022

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Wittenmyer, R. A., Clark, J. T., Trifonov, T., Addison, B. C., Wright, D. J., Stassun, K. G., Horner, J., Lowson, N., Kielkopf, J., Kane, S. R., Plavchan, P., Shporer, A., Zhang, H., Bowler, B. P., Mengel, M. W., Okumura, J., Rabus, M., Johnson, M. C., Harbeck, D., ... Bouma, L. G. (2022). TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant. Astronomical Journal, 163(2), Article 82. https://doi.org/10.3847/1538-3881/ac3f39

@article{abf6f8afdb3344bc89c0b671b7e9f3a2,

title = "TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant",

abstract = "The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of RJ, a mass of MJ, an orbital period of days, and an extremely low density (ρ = 0.252 ± 0.091 g cm−3). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterization. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hr also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterization.",

author = "Wittenmyer, {Robert A.} and Clark, {Jake T.} and Trifon Trifonov and Addison, {Brett C.} and Wright, {Duncan J.} and Stassun, {Keivan G.} and Jonathan Horner and Nataliea Lowson and John Kielkopf and Kane, {Stephen R.} and Peter Plavchan and Avi Shporer and Hui Zhang and Bowler, {Brendan P.} and Mengel, {Matthew W.} and Jack Okumura and Markus Rabus and Johnson, {Marshall C.} and Daniel Harbeck and Ren{\'e} Tronsgaard and Buchhave, {Lars A.} and Collins, {Karen A.} and Collins, {Kevin I.} and Tianjun Gan and Jensen, {Eric L. N.} and Howell, {Steve B.} and E. Furlan and Gnilka, {Crystal L.} and Lester, {Kathryn V.} and Matson, {Rachel A.} and Scott, {Nicholas J.} and Ricker, {George R.} and Roland Vanderspek and Latham, {David W.} and S. Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and Alexander Rudat and Quintana, {Elisa V.} and Rodriguez, {David R.} and Caldwell, {Douglas A.} and Quinn, {Samuel N.} and Zahra Essack and Bouma, {Luke G.}",

year = "2022",

doi = "10.3847/1538-3881/ac3f39",

language = "English",

volume = "163",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing",

number = "2",

}

Wittenmyer, RA, Clark, JT, Trifonov, T, Addison, BC, Wright, DJ, Stassun, KG, Horner, J, Lowson, N, Kielkopf, J, Kane, SR, Plavchan, P, Shporer, A, Zhang, H, Bowler, BP, Mengel, MW, Okumura, J, Rabus, M, Johnson, MC, Harbeck, D, Tronsgaard, R, Buchhave, LA, Collins, KA, Collins, KI, Gan, T, Jensen, ELN, Howell, SB, Furlan, E, Gnilka, CL, Lester, KV, Matson, RA, Scott, NJ, Ricker, GR, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Rudat, A, Quintana, EV, Rodriguez, DR, Caldwell, DA, Quinn, SN, Essack, Z & Bouma, LG 2022, 'TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant', Astronomical Journal, vol. 163, no. 2, 82. https://doi.org/10.3847/1538-3881/ac3f39

TY - JOUR

T1 - TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant

AU - Wittenmyer, Robert A.

AU - Clark, Jake T.

AU - Trifonov, Trifon

AU - Addison, Brett C.

AU - Wright, Duncan J.

AU - Stassun, Keivan G.

AU - Horner, Jonathan

AU - Lowson, Nataliea

AU - Kielkopf, John

AU - Kane, Stephen R.

AU - Plavchan, Peter

AU - Shporer, Avi

AU - Zhang, Hui

AU - Bowler, Brendan P.

AU - Mengel, Matthew W.

AU - Okumura, Jack

AU - Rabus, Markus

AU - Johnson, Marshall C.

AU - Harbeck, Daniel

AU - Tronsgaard, René

AU - Buchhave, Lars A.

AU - Collins, Karen A.

AU - Collins, Kevin I.

AU - Gan, Tianjun

AU - Jensen, Eric L. N.

AU - Howell, Steve B.

AU - Furlan, E.

AU - Gnilka, Crystal L.

AU - Lester, Kathryn V.

AU - Matson, Rachel A.

AU - Scott, Nicholas J.

AU - Ricker, George R.

AU - Vanderspek, Roland

AU - Latham, David W.

AU - Seager, S.

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Rudat, Alexander

AU - Quintana, Elisa V.

AU - Rodriguez, David R.

AU - Caldwell, Douglas A.

AU - Quinn, Samuel N.

AU - Essack, Zahra

AU - Bouma, Luke G.

PY - 2022

Y1 - 2022

N2 - The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of RJ, a mass of MJ, an orbital period of days, and an extremely low density (ρ = 0.252 ± 0.091 g cm−3). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterization. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hr also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterization.

AB - The imminent launch of space telescopes designed to probe the atmospheres of exoplanets has prompted new efforts to prioritize the thousands of transiting planet candidates for follow-up characterization. We report the detection and confirmation of TOI-1842b, a warm Saturn identified by TESS and confirmed with ground-based observations from Minerva-Australis, NRES, and the Las Cumbres Observatory Global Telescope. This planet has a radius of RJ, a mass of MJ, an orbital period of days, and an extremely low density (ρ = 0.252 ± 0.091 g cm−3). TOI-1842b has among the best known combinations of large atmospheric scale height (893 km) and host-star brightness (J = 8.747 mag), making it an attractive target for atmospheric characterization. As the host star is beginning to evolve off the main sequence, TOI-1842b presents an excellent opportunity to test models of gas giant reinflation. The primary transit duration of only 4.3 hr also makes TOI-1842b an easily-schedulable target for further ground-based atmospheric characterization.

U2 - 10.3847/1538-3881/ac3f39

DO - 10.3847/1538-3881/ac3f39

M3 - Journal article

SN - 0004-6256

VL - 163

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

M1 - 82

ER -

TOI-1842b: A Transiting Warm Saturn Undergoing Reinflation around an Evolving Subgiant

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