HD 56414 b: A Warm Neptune Transiting an A-type Star

Steven Giacalone; Courtney D. Dressing; A. García Muñoz; Matthew J. Hooton; Keivan G. Stassun; Samuel N. Quinn; George Zhou; Carl Ziegler; Roland Vanderspek; David W. Latham; S. Seager; Joshua N. Winn; Jon M. Jenkins; César Briceño; Chelsea X. Huang; David R. Rodriguez; Avi Shporer; Andrew W. Mann; David Watanabe; Bill Wohler

doi:10.3847/2041-8213/ac80f4

HD 56414 b: A Warm Neptune Transiting an A-type Star

Steven Giacalone, Courtney D. Dressing, A. García Muñoz, Matthew J. Hooton, Keivan G. Stassun, Samuel N. Quinn, George Zhou, Carl Ziegler, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, César Briceño, Chelsea X. Huang, David R. Rodriguez, Avi Shporer, Andrew W. Mann, David Watanabe, Bill Wohler

Astrophysical Sciences

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Abstract

We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R _p = 3.71 ± 0.20 R _⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing zone. HD 56414 is one of the hottest stars (T _eff = 8500 ± 150 K) to host a known sub-Jovian planet. HD 56414 b lies on the boundary of the hot Neptune desert in the planet radius-bolometric insolation flux space, suggesting that the planet may be experiencing mass loss. To explore this, we apply a photoevaporation model that incorporates the high near-ultraviolet continuum emission of A-type stars. We find that the planet can retain most of its atmosphere over the typical 1 Gyr main-sequence lifetime of an A-type star if its mass is ≥8 M _⊕. Our model also predicts that close-in Neptune-size planets with masses <14 M _⊕ are susceptible to total atmospheric stripping over 1 Gyr, hinting that the hot Neptune desert, which has been previously observed around FGKM-type stars, likely extends to A-type stars.

Original language	English (US)
Article number	L10
Journal	Astrophysical Journal Letters
Volume	935
Issue number	1
DOIs	https://doi.org/10.3847/2041-8213/ac80f4
State	Published - Aug 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/2041-8213/ac80f4

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Giacalone, S., Dressing, C. D., Muñoz, A. G., Hooton, M. J., Stassun, K. G., Quinn, S. N., Zhou, G., Ziegler, C., Vanderspek, R., Latham, D. W., Seager, S., Winn, J. N., Jenkins, J. M., Briceño, C., Huang, C. X., Rodriguez, D. R., Shporer, A., Mann, A. W., Watanabe, D., & Wohler, B. (2022). HD 56414 b: A Warm Neptune Transiting an A-type Star. Astrophysical Journal Letters, 935(1), Article L10. https://doi.org/10.3847/2041-8213/ac80f4

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title = "HD 56414 b: A Warm Neptune Transiting an A-type Star",

abstract = "We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R p = 3.71 ± 0.20 R ⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing zone. HD 56414 is one of the hottest stars (T eff = 8500 ± 150 K) to host a known sub-Jovian planet. HD 56414 b lies on the boundary of the hot Neptune desert in the planet radius-bolometric insolation flux space, suggesting that the planet may be experiencing mass loss. To explore this, we apply a photoevaporation model that incorporates the high near-ultraviolet continuum emission of A-type stars. We find that the planet can retain most of its atmosphere over the typical 1 Gyr main-sequence lifetime of an A-type star if its mass is ≥8 M ⊕. Our model also predicts that close-in Neptune-size planets with masses <14 M ⊕ are susceptible to total atmospheric stripping over 1 Gyr, hinting that the hot Neptune desert, which has been previously observed around FGKM-type stars, likely extends to A-type stars.",

author = "Steven Giacalone and Dressing, {Courtney D.} and Mu{\~n}oz, {A. Garc{\'i}a} and Hooton, {Matthew J.} and Stassun, {Keivan G.} and Quinn, {Samuel N.} and George Zhou and Carl Ziegler and Roland Vanderspek and Latham, {David W.} and S. Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and C{\'e}sar Brice{\~n}o and Huang, {Chelsea X.} and Rodriguez, {David R.} and Avi Shporer and Mann, {Andrew W.} and David Watanabe and Bill Wohler",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = aug,

day = "1",

doi = "10.3847/2041-8213/ac80f4",

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Giacalone, S, Dressing, CD, Muñoz, AG, Hooton, MJ, Stassun, KG, Quinn, SN, Zhou, G, Ziegler, C, Vanderspek, R, Latham, DW, Seager, S, Winn, JN, Jenkins, JM, Briceño, C, Huang, CX, Rodriguez, DR, Shporer, A, Mann, AW, Watanabe, D & Wohler, B 2022, 'HD 56414 b: A Warm Neptune Transiting an A-type Star', Astrophysical Journal Letters, vol. 935, no. 1, L10. https://doi.org/10.3847/2041-8213/ac80f4

TY - JOUR

T1 - HD 56414 b

T2 - A Warm Neptune Transiting an A-type Star

AU - Giacalone, Steven

AU - Dressing, Courtney D.

AU - Muñoz, A. García

AU - Hooton, Matthew J.

AU - Stassun, Keivan G.

AU - Quinn, Samuel N.

AU - Zhou, George

AU - Ziegler, Carl

AU - Vanderspek, Roland

AU - Latham, David W.

AU - Seager, S.

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Briceño, César

AU - Huang, Chelsea X.

AU - Rodriguez, David R.

AU - Shporer, Avi

AU - Mann, Andrew W.

AU - Watanabe, David

AU - Wohler, Bill

PY - 2022/8/1

Y1 - 2022/8/1

N2 - We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R p = 3.71 ± 0.20 R ⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing zone. HD 56414 is one of the hottest stars (T eff = 8500 ± 150 K) to host a known sub-Jovian planet. HD 56414 b lies on the boundary of the hot Neptune desert in the planet radius-bolometric insolation flux space, suggesting that the planet may be experiencing mass loss. To explore this, we apply a photoevaporation model that incorporates the high near-ultraviolet continuum emission of A-type stars. We find that the planet can retain most of its atmosphere over the typical 1 Gyr main-sequence lifetime of an A-type star if its mass is ≥8 M ⊕. Our model also predicts that close-in Neptune-size planets with masses <14 M ⊕ are susceptible to total atmospheric stripping over 1 Gyr, hinting that the hot Neptune desert, which has been previously observed around FGKM-type stars, likely extends to A-type stars.

AB - We report the discovery in TESS data and validation of HD 56414 b (a.k.a. TOI-1228 b), a Neptune-size (R p = 3.71 ± 0.20 R ⊕) planet with a 29 day orbital period transiting a young (age = 420 ± 140 Myr) A-type star in the TESS southern continuous-viewing zone. HD 56414 is one of the hottest stars (T eff = 8500 ± 150 K) to host a known sub-Jovian planet. HD 56414 b lies on the boundary of the hot Neptune desert in the planet radius-bolometric insolation flux space, suggesting that the planet may be experiencing mass loss. To explore this, we apply a photoevaporation model that incorporates the high near-ultraviolet continuum emission of A-type stars. We find that the planet can retain most of its atmosphere over the typical 1 Gyr main-sequence lifetime of an A-type star if its mass is ≥8 M ⊕. Our model also predicts that close-in Neptune-size planets with masses <14 M ⊕ are susceptible to total atmospheric stripping over 1 Gyr, hinting that the hot Neptune desert, which has been previously observed around FGKM-type stars, likely extends to A-type stars.

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DO - 10.3847/2041-8213/ac80f4

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VL - 935

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 1

M1 - L10

ER -

HD 56414 b: A Warm Neptune Transiting an A-type Star

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