NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars

Jose I. Vines; James S. Jenkins; David R. Anderson; Douglas R. Alves; Maximiliano Moyano; Jack S. Acton; Ioannis Apergis; Khalid Barkaoui; Daniel Bayliss; Francois Bouchy; Edward M. Bryant; Matthew R. Burleigh; Sarah L. Casewell; Jessie L. Christiansen; Karen A. Collins; Philipp Eigmüller; Ben Falk; Samuel Gill; Edward Gillen; Michael R. Goad; Maximilian N. Günther; Beth A. Henderson; Alicia Kendall; Monika Lendl; James McCormac; Louise D. Nielsen; Ares Osborn; Gavin Ramsay; George R. Ricker; Pamela Rowden; Alexander Rudat; Suman Saha; Sara Seager; Alexis M.S. Smith; Thiam Guan Tan; Rosanna H. Tilbrook; Stéphane Udry; Richard West; Peter J. Wheatley; Joshua N. Winn; Tafadzwa Zivave

doi:10.1093/mnras/stae2616

NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars

Jose I. Vines, James S. Jenkins, David R. Anderson, Douglas R. Alves, Maximiliano Moyano, Jack S. Acton, Ioannis Apergis, Khalid Barkaoui, Daniel Bayliss, Francois Bouchy, Edward M. Bryant, Matthew R. Burleigh, Sarah L. Casewell, Jessie L. Christiansen, Karen A. Collins, Philipp Eigmüller, Ben Falk, Samuel Gill, Edward Gillen, Michael R. GoadMaximilian N. Günther, Beth A. Henderson, Alicia Kendall, Monika Lendl, James McCormac, Louise D. Nielsen, Ares Osborn, Gavin Ramsay, George R. Ricker, Pamela Rowden, Alexander Rudat, Suman Saha, Sara Seager, Alexis M.S. Smith, Thiam Guan Tan, Rosanna H. Tilbrook, Stéphane Udry, Richard West, Peter J. Wheatley, Joshua N. Winn, Tafadzwa Zivave

Astrophysical Sciences

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

Abstract

We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42, and 1.12 and 0.57, respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation. These planets have widely different equilibrium temperatures than other hot Jupiters of similar mass and radius, with NGTS-31b having a significantly lower temperature, and NGTS-32b being hotter. This dichotomy raises the question of how prevalent the roles of other inflation mechanisms are in the radius anomaly phenomena and will help further constrain different inflationary models.

Original language	English (US)
Pages (from-to)	2011-2024
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	536
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stae2616
State	Published - Jan 1 2025

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planetary systems
techniques: photometric

Access to Document

10.1093/mnras/stae2616

Cite this

Vines, J. I., Jenkins, J. S., Anderson, D. R., Alves, D. R., Moyano, M., Acton, J. S., Apergis, I., Barkaoui, K., Bayliss, D., Bouchy, F., Bryant, E. M., Burleigh, M. R., Casewell, S. L., Christiansen, J. L., Collins, K. A., Eigmüller, P., Falk, B., Gill, S., Gillen, E., ... Zivave, T. (2025). NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars. Monthly Notices of the Royal Astronomical Society, 536(3), 2011-2024. https://doi.org/10.1093/mnras/stae2616

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title = "NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars",

abstract = "We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42, and 1.12 and 0.57, respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation. These planets have widely different equilibrium temperatures than other hot Jupiters of similar mass and radius, with NGTS-31b having a significantly lower temperature, and NGTS-32b being hotter. This dichotomy raises the question of how prevalent the roles of other inflation mechanisms are in the radius anomaly phenomena and will help further constrain different inflationary models.",

keywords = "planetary systems, techniques: photometric",

author = "Vines, {Jose I.} and Jenkins, {James S.} and Anderson, {David R.} and Alves, {Douglas R.} and Maximiliano Moyano and Acton, {Jack S.} and Ioannis Apergis and Khalid Barkaoui and Daniel Bayliss and Francois Bouchy and Bryant, {Edward M.} and Burleigh, {Matthew R.} and Casewell, {Sarah L.} and Christiansen, {Jessie L.} and Collins, {Karen A.} and Philipp Eigm{\"u}ller and Ben Falk and Samuel Gill and Edward Gillen and Goad, {Michael R.} and G{\"u}nther, {Maximilian N.} and Henderson, {Beth A.} and Alicia Kendall and Monika Lendl and James McCormac and Nielsen, {Louise D.} and Ares Osborn and Gavin Ramsay and Ricker, {George R.} and Pamela Rowden and Alexander Rudat and Suman Saha and Sara Seager and Smith, {Alexis M.S.} and Tan, {Thiam Guan} and Tilbrook, {Rosanna H.} and St{\'e}phane Udry and Richard West and Wheatley, {Peter J.} and Winn, {Joshua N.} and Tafadzwa Zivave",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.",

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doi = "10.1093/mnras/stae2616",

language = "English (US)",

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Vines, JI, Jenkins, JS, Anderson, DR, Alves, DR, Moyano, M, Acton, JS, Apergis, I, Barkaoui, K, Bayliss, D, Bouchy, F, Bryant, EM, Burleigh, MR, Casewell, SL, Christiansen, JL, Collins, KA, Eigmüller, P, Falk, B, Gill, S, Gillen, E, Goad, MR, Günther, MN, Henderson, BA, Kendall, A, Lendl, M, McCormac, J, Nielsen, LD, Osborn, A, Ramsay, G, Ricker, GR, Rowden, P, Rudat, A, Saha, S, Seager, S, Smith, AMS, Tan, TG, Tilbrook, RH, Udry, S, West, R, Wheatley, PJ, Winn, JN & Zivave, T 2025, 'NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars', Monthly Notices of the Royal Astronomical Society, vol. 536, no. 3, pp. 2011-2024. https://doi.org/10.1093/mnras/stae2616

TY - JOUR

T1 - NGTS-31b and NGTS-32b

T2 - Two inflated hot jupiters orbiting subgiant stars

AU - Vines, Jose I.

AU - Jenkins, James S.

AU - Anderson, David R.

AU - Alves, Douglas R.

AU - Moyano, Maximiliano

AU - Acton, Jack S.

AU - Apergis, Ioannis

AU - Barkaoui, Khalid

AU - Bayliss, Daniel

AU - Bouchy, Francois

AU - Bryant, Edward M.

AU - Burleigh, Matthew R.

AU - Casewell, Sarah L.

AU - Christiansen, Jessie L.

AU - Collins, Karen A.

AU - Eigmüller, Philipp

AU - Falk, Ben

AU - Gill, Samuel

AU - Gillen, Edward

AU - Goad, Michael R.

AU - Günther, Maximilian N.

AU - Henderson, Beth A.

AU - Kendall, Alicia

AU - Lendl, Monika

AU - McCormac, James

AU - Nielsen, Louise D.

AU - Osborn, Ares

AU - Ramsay, Gavin

AU - Ricker, George R.

AU - Rowden, Pamela

AU - Rudat, Alexander

AU - Saha, Suman

AU - Seager, Sara

AU - Smith, Alexis M.S.

AU - Tan, Thiam Guan

AU - Tilbrook, Rosanna H.

AU - Udry, Stéphane

AU - West, Richard

AU - Wheatley, Peter J.

AU - Winn, Joshua N.

AU - Zivave, Tafadzwa

PY - 2025/1/1

Y1 - 2025/1/1

N2 - We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42, and 1.12 and 0.57, respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation. These planets have widely different equilibrium temperatures than other hot Jupiters of similar mass and radius, with NGTS-31b having a significantly lower temperature, and NGTS-32b being hotter. This dichotomy raises the question of how prevalent the roles of other inflation mechanisms are in the radius anomaly phenomena and will help further constrain different inflationary models.

AB - We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42, and 1.12 and 0.57, respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation. These planets have widely different equilibrium temperatures than other hot Jupiters of similar mass and radius, with NGTS-31b having a significantly lower temperature, and NGTS-32b being hotter. This dichotomy raises the question of how prevalent the roles of other inflation mechanisms are in the radius anomaly phenomena and will help further constrain different inflationary models.

KW - planetary systems

KW - techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=85216279591&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85216279591&partnerID=8YFLogxK

U2 - 10.1093/mnras/stae2616

DO - 10.1093/mnras/stae2616

M3 - Article

AN - SCOPUS:85216279591

SN - 0035-8711

VL - 536

SP - 2011

EP - 2024

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

NGTS-31b and NGTS-32b: Two inflated hot jupiters orbiting subgiant stars

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