The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166

Mason G. Macdougall; Erik A. Petigura; Isabel Angelo; Jack Lubin; Natalie M. Batalha; Corey Beard; Aida Behmard; Sarah Blunt; Casey Brinkman; Ashley Chontos; Ian J.M. Crossfield; Fei Dai; Paul A. Dalba; Courtney Dressing; Benjamin Fulton; Steven Giacalone; Michelle L. Hill; Andrew W. Howard; Daniel Huber; Howard Isaacson; Stephen R. Kane; Andrew Mayo; Teo Močnik; Joseph M. Akana Murphy; Alex Polanski; Malena Rice; Paul Robertson; Lee J. Rosenthal; Arpita Roy; Ryan A. Rubenzahl; Nicholas Scarsdale; Emma Turtelboom; Judah Van Zandt; Lauren M. Weiss; Elisabeth Matthews; Jon M. Jenkins; David W. Latham; George R. Ricker; S. Seager; Roland K. Vanderspek; Joshua N. Winn; C. E. Brasseur; John Doty; Michael Fausnaugh; Natalia Guerrero; Chris Henze; Michael B. Lund; Avi Shporer

doi:10.3847/1538-3881/ac295e

The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166

Mason G. Macdougall, Erik A. Petigura, Isabel Angelo, Jack Lubin, Natalie M. Batalha, Corey Beard, Aida Behmard, Sarah Blunt, Casey Brinkman, Ashley Chontos, Ian J.M. Crossfield, Fei Dai, Paul A. Dalba, Courtney Dressing, Benjamin Fulton, Steven Giacalone, Michelle L. Hill, Andrew W. Howard, Daniel Huber, Howard IsaacsonStephen R. Kane, Andrew Mayo, Teo Močnik, Joseph M. Akana Murphy, Alex Polanski, Malena Rice, Paul Robertson, Lee J. Rosenthal, Arpita Roy, Ryan A. Rubenzahl, Nicholas Scarsdale, Emma Turtelboom, Judah Van Zandt, Lauren M. Weiss, Elisabeth Matthews, Jon M. Jenkins, David W. Latham, George R. Ricker, S. Seager, Roland K. Vanderspek, Joshua N. Winn, C. E. Brasseur, John Doty, Michael Fausnaugh, Natalia Guerrero, Chris Henze, Michael B. Lund, Avi Shporer

Astrophysical Sciences

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Abstract

We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. We confirmed the planetary nature of HIP-97166b with ground-based radial-velocity measurements and measured a mass of M b = 20 2 M ⊕ along with a radius of R b = 2.7 0.1 R ⊕ from photometry. We detected an additional nontransiting planetary companion with M c sini = 10 2 M ⊕ on a 16.8 day orbit. While the short transit duration of the inner planet initially suggested a high eccentricity, a joint RV-photometry analysis revealed a high impact parameter b = 0.84 0.03 and a moderate eccentricity. Modeling the dynamics with the condition that the system remain stable over >105 orbits yielded eccentricity constraints e b = 0.16 0.03 and e c < 0.25. The eccentricity we find for planet b is above average for the small population of sub-Neptunes with well-measured eccentricities. We explored the plausible formation pathways of this system, proposing an early instability and merger event to explain the high density of the inner planet at 5.3 0.9 g cc-1 as well as its moderate eccentricity and proximity to a 5:3 mean-motion resonance.

Original language	English (US)
Article number	265
Journal	Astronomical Journal
Volume	162
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/ac295e
State	Published - Dec 1 2021

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ac295e

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Macdougall, M. G., Petigura, E. A., Angelo, I., Lubin, J., Batalha, N. M., Beard, C., Behmard, A., Blunt, S., Brinkman, C., Chontos, A., Crossfield, I. J. M., Dai, F., Dalba, P. A., Dressing, C., Fulton, B., Giacalone, S., Hill, M. L., Howard, A. W., Huber, D., ... Shporer, A. (2021). The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166. Astronomical Journal, 162(6), Article 265. https://doi.org/10.3847/1538-3881/ac295e

@article{3396ff1a5fe74540be76c9a8a951c4d1,

title = "The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166",

abstract = "We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. We confirmed the planetary nature of HIP-97166b with ground-based radial-velocity measurements and measured a mass of M b = 20 2 M ⊕ along with a radius of R b = 2.7 0.1 R ⊕ from photometry. We detected an additional nontransiting planetary companion with M c sini = 10 2 M ⊕ on a 16.8 day orbit. While the short transit duration of the inner planet initially suggested a high eccentricity, a joint RV-photometry analysis revealed a high impact parameter b = 0.84 0.03 and a moderate eccentricity. Modeling the dynamics with the condition that the system remain stable over >105 orbits yielded eccentricity constraints e b = 0.16 0.03 and e c < 0.25. The eccentricity we find for planet b is above average for the small population of sub-Neptunes with well-measured eccentricities. We explored the plausible formation pathways of this system, proposing an early instability and merger event to explain the high density of the inner planet at 5.3 0.9 g cc-1 as well as its moderate eccentricity and proximity to a 5:3 mean-motion resonance.",

author = "Macdougall, {Mason G.} and Petigura, {Erik A.} and Isabel Angelo and Jack Lubin and Batalha, {Natalie M.} and Corey Beard and Aida Behmard and Sarah Blunt and Casey Brinkman and Ashley Chontos and Crossfield, {Ian J.M.} and Fei Dai and Dalba, {Paul A.} and Courtney Dressing and Benjamin Fulton and Steven Giacalone and Hill, {Michelle L.} and Howard, {Andrew W.} and Daniel Huber and Howard Isaacson and Kane, {Stephen R.} and Andrew Mayo and Teo Mo{\v c}nik and {Akana Murphy}, {Joseph M.} and Alex Polanski and Malena Rice and Paul Robertson and Rosenthal, {Lee J.} and Arpita Roy and Rubenzahl, {Ryan A.} and Nicholas Scarsdale and Emma Turtelboom and Zandt, {Judah Van} and Weiss, {Lauren M.} and Elisabeth Matthews and Jenkins, {Jon M.} and Latham, {David W.} and Ricker, {George R.} and S. Seager and Vanderspek, {Roland K.} and Winn, {Joshua N.} and Brasseur, {C. E.} and John Doty and Michael Fausnaugh and Natalia Guerrero and Chris Henze and Lund, {Michael B.} and Avi Shporer",

year = "2021",

month = dec,

day = "1",

doi = "10.3847/1538-3881/ac295e",

language = "English (US)",

volume = "162",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "6",

}

Macdougall, MG, Petigura, EA, Angelo, I, Lubin, J, Batalha, NM, Beard, C, Behmard, A, Blunt, S, Brinkman, C, Chontos, A, Crossfield, IJM, Dai, F, Dalba, PA, Dressing, C, Fulton, B, Giacalone, S, Hill, ML, Howard, AW, Huber, D, Isaacson, H, Kane, SR, Mayo, A, Močnik, T, Akana Murphy, JM, Polanski, A, Rice, M, Robertson, P, Rosenthal, LJ, Roy, A, Rubenzahl, RA, Scarsdale, N, Turtelboom, E, Zandt, JV, Weiss, LM, Matthews, E, Jenkins, JM, Latham, DW, Ricker, GR, Seager, S, Vanderspek, RK, Winn, JN, Brasseur, CE, Doty, J, Fausnaugh, M, Guerrero, N, Henze, C, Lund, MB & Shporer, A 2021, 'The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166', Astronomical Journal, vol. 162, no. 6, 265. https://doi.org/10.3847/1538-3881/ac295e

TY - JOUR

T1 - The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166

AU - Macdougall, Mason G.

AU - Petigura, Erik A.

AU - Angelo, Isabel

AU - Lubin, Jack

AU - Batalha, Natalie M.

AU - Beard, Corey

AU - Behmard, Aida

AU - Blunt, Sarah

AU - Brinkman, Casey

AU - Chontos, Ashley

AU - Crossfield, Ian J.M.

AU - Dai, Fei

AU - Dalba, Paul A.

AU - Dressing, Courtney

AU - Fulton, Benjamin

AU - Giacalone, Steven

AU - Hill, Michelle L.

AU - Howard, Andrew W.

AU - Huber, Daniel

AU - Isaacson, Howard

AU - Kane, Stephen R.

AU - Mayo, Andrew

AU - Močnik, Teo

AU - Akana Murphy, Joseph M.

AU - Polanski, Alex

AU - Rice, Malena

AU - Robertson, Paul

AU - Rosenthal, Lee J.

AU - Roy, Arpita

AU - Rubenzahl, Ryan A.

AU - Scarsdale, Nicholas

AU - Turtelboom, Emma

AU - Zandt, Judah Van

AU - Weiss, Lauren M.

AU - Matthews, Elisabeth

AU - Jenkins, Jon M.

AU - Latham, David W.

AU - Ricker, George R.

AU - Seager, S.

AU - Vanderspek, Roland K.

AU - Winn, Joshua N.

AU - Brasseur, C. E.

AU - Doty, John

AU - Fausnaugh, Michael

AU - Guerrero, Natalia

AU - Henze, Chris

AU - Lund, Michael B.

AU - Shporer, Avi

PY - 2021/12/1

Y1 - 2021/12/1

N2 - We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. We confirmed the planetary nature of HIP-97166b with ground-based radial-velocity measurements and measured a mass of M b = 20 2 M ⊕ along with a radius of R b = 2.7 0.1 R ⊕ from photometry. We detected an additional nontransiting planetary companion with M c sini = 10 2 M ⊕ on a 16.8 day orbit. While the short transit duration of the inner planet initially suggested a high eccentricity, a joint RV-photometry analysis revealed a high impact parameter b = 0.84 0.03 and a moderate eccentricity. Modeling the dynamics with the condition that the system remain stable over >105 orbits yielded eccentricity constraints e b = 0.16 0.03 and e c < 0.25. The eccentricity we find for planet b is above average for the small population of sub-Neptunes with well-measured eccentricities. We explored the plausible formation pathways of this system, proposing an early instability and merger event to explain the high density of the inner planet at 5.3 0.9 g cc-1 as well as its moderate eccentricity and proximity to a 5:3 mean-motion resonance.

AB - We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3 day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic search of TESS Objects of Interest for planets with eccentric orbits, based on a mismatch between the observed transit duration and the expected duration for a circular orbit. We confirmed the planetary nature of HIP-97166b with ground-based radial-velocity measurements and measured a mass of M b = 20 2 M ⊕ along with a radius of R b = 2.7 0.1 R ⊕ from photometry. We detected an additional nontransiting planetary companion with M c sini = 10 2 M ⊕ on a 16.8 day orbit. While the short transit duration of the inner planet initially suggested a high eccentricity, a joint RV-photometry analysis revealed a high impact parameter b = 0.84 0.03 and a moderate eccentricity. Modeling the dynamics with the condition that the system remain stable over >105 orbits yielded eccentricity constraints e b = 0.16 0.03 and e c < 0.25. The eccentricity we find for planet b is above average for the small population of sub-Neptunes with well-measured eccentricities. We explored the plausible formation pathways of this system, proposing an early instability and merger event to explain the high density of the inner planet at 5.3 0.9 g cc-1 as well as its moderate eccentricity and proximity to a 5:3 mean-motion resonance.

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U2 - 10.3847/1538-3881/ac295e

DO - 10.3847/1538-3881/ac295e

M3 - Article

AN - SCOPUS:85120816812

SN - 0004-6256

VL - 162

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

M1 - 265

ER -

The TESS-Keck Survey. VI. Two Eccentric Sub-Neptunes Orbiting HIP-97166

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