TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Akihiko Fukui; Tadahiro Kimura; Teruyuki Hirano; Norio Narita; Takanori Kodama; Yasunori Hori; Masahiro Ikoma; Enric Pallé; Felipe Murgas; Hannu Parviainen; Kiyoe Kawauchi; Mayuko Mori; Emma Esparza-Borges; Allyson Bieryla; Jonathan Irwin; Boris S. Safonov; Keivan G. Stassun; Leticia Alvarez-Hernandez; Víctor J.S. Béjar; Núria Casasayas-Barris; Guo Chen; Nicolas Crouzet; Jerome P. De Leon; Keisuke Isogai; Taiki Kagetani; Peter Klagyivik; Judith Korth; Seiya Kurita; Nobuhiko Kusakabe; John Livingston; Rafael Luque; Alberto Madrigal-Aguado; Giuseppe Morello; Taku Nishiumi; Jaume Orell-Miquel; Mahmoudreza Oshagh; Manuel Śanchez-Benavente; Monika Stangret; Yuka Terada; Noriharu Watanabe; Yujie Zou; Motohide Tamura; Takashi Kurokawa; Masayuki Kuzuhara; Jun Nishikawa; Masashi Omiya; Sébastien Vievard; Akitoshi Ueda; David W. Latham; Samuel N. Quinn; Ivan S. Strakhov; Alexandr A. Belinski; Jon M. Jenkins; George R. Ricker; Sara Seager; Roland Vanderspek; Joshua N. Winn; David Charbonneau; David R. Ciardi; Karen A. Collins; John P. Doty; Etienne Bachelet; Daniel Harbeck

doi:10.1093/pasj/psab106

TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

Akihiko Fukui, Tadahiro Kimura, Teruyuki Hirano, Norio Narita, Takanori Kodama, Yasunori Hori, Masahiro Ikoma, Enric Pallé, Felipe Murgas, Hannu Parviainen, Kiyoe Kawauchi, Mayuko Mori, Emma Esparza-Borges, Allyson Bieryla, Jonathan Irwin, Boris S. Safonov, Keivan G. Stassun, Leticia Alvarez-Hernandez, Víctor J.S. Béjar, Núria Casasayas-BarrisGuo Chen, Nicolas Crouzet, Jerome P. De Leon, Keisuke Isogai, Taiki Kagetani, Peter Klagyivik, Judith Korth, Seiya Kurita, Nobuhiko Kusakabe, John Livingston, Rafael Luque, Alberto Madrigal-Aguado, Giuseppe Morello, Taku Nishiumi, Jaume Orell-Miquel, Mahmoudreza Oshagh, Manuel Śanchez-Benavente, Monika Stangret, Yuka Terada, Noriharu Watanabe, Yujie Zou, Motohide Tamura, Takashi Kurokawa, Masayuki Kuzuhara, Jun Nishikawa, Masashi Omiya, Sébastien Vievard, Akitoshi Ueda, David W. Latham, Samuel N. Quinn, Ivan S. Strakhov, Alexandr A. Belinski, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland Vanderspek, Joshua N. Winn, David Charbonneau, David R. Ciardi, Karen A. Collins, John P. Doty, Etienne Bachelet, Daniel Harbeck

Astrophysical Sciences

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8 Scopus citations

Abstract

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

Original language	English (US)
Pages (from-to)	L1-L8
Journal	Publications of the Astronomical Society of Japan
Volume	74
Issue number	1
DOIs	https://doi.org/10.1093/pasj/psab106
State	Published - Feb 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets and satellites: detection
planets and satellites: individual (TOI-2285b)
planets and satellites: interiors
techniques: photometric
techniques: radial velocities

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10.1093/pasj/psab106

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Fukui, A., Kimura, T., Hirano, T., Narita, N., Kodama, T., Hori, Y., Ikoma, M., Pallé, E., Murgas, F., Parviainen, H., Kawauchi, K., Mori, M., Esparza-Borges, E., Bieryla, A., Irwin, J., Safonov, B. S., Stassun, K. G., Alvarez-Hernandez, L., Béjar, V. J. S., ... Harbeck, D. (2022). TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf. Publications of the Astronomical Society of Japan, 74(1), L1-L8. https://doi.org/10.1093/pasj/psab106

@article{f7c7665e68bd468a8127b31cadffb488,

title = "TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf",

abstract = "We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.",

keywords = "planets and satellites: detection, planets and satellites: individual (TOI-2285b), planets and satellites: interiors, techniques: photometric, techniques: radial velocities",

author = "Akihiko Fukui and Tadahiro Kimura and Teruyuki Hirano and Norio Narita and Takanori Kodama and Yasunori Hori and Masahiro Ikoma and Enric Pall{\'e} and Felipe Murgas and Hannu Parviainen and Kiyoe Kawauchi and Mayuko Mori and Emma Esparza-Borges and Allyson Bieryla and Jonathan Irwin and Safonov, {Boris S.} and Stassun, {Keivan G.} and Leticia Alvarez-Hernandez and B{\'e}jar, {V{\'i}ctor J.S.} and N{\'u}ria Casasayas-Barris and Guo Chen and Nicolas Crouzet and {De Leon}, {Jerome P.} and Keisuke Isogai and Taiki Kagetani and Peter Klagyivik and Judith Korth and Seiya Kurita and Nobuhiko Kusakabe and John Livingston and Rafael Luque and Alberto Madrigal-Aguado and Giuseppe Morello and Taku Nishiumi and Jaume Orell-Miquel and Mahmoudreza Oshagh and Manuel {\'S}anchez-Benavente and Monika Stangret and Yuka Terada and Noriharu Watanabe and Yujie Zou and Motohide Tamura and Takashi Kurokawa and Masayuki Kuzuhara and Jun Nishikawa and Masashi Omiya and S{\'e}bastien Vievard and Akitoshi Ueda and Latham, {David W.} and Quinn, {Samuel N.} and Strakhov, {Ivan S.} and Belinski, {Alexandr A.} and Jenkins, {Jon M.} and Ricker, {George R.} and Sara Seager and Roland Vanderspek and Winn, {Joshua N.} and David Charbonneau and Ciardi, {David R.} and Collins, {Karen A.} and Doty, {John P.} and Etienne Bachelet and Daniel Harbeck",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s).",

year = "2022",

month = feb,

day = "1",

doi = "10.1093/pasj/psab106",

language = "English (US)",

volume = "74",

pages = "L1--L8",

journal = "Publications of the Astronomical Society of Japan",

issn = "0004-6264",

publisher = "Oxford University Press",

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Fukui, A, Kimura, T, Hirano, T, Narita, N, Kodama, T, Hori, Y, Ikoma, M, Pallé, E, Murgas, F, Parviainen, H, Kawauchi, K, Mori, M, Esparza-Borges, E, Bieryla, A, Irwin, J, Safonov, BS, Stassun, KG, Alvarez-Hernandez, L, Béjar, VJS, Casasayas-Barris, N, Chen, G, Crouzet, N, De Leon, JP, Isogai, K, Kagetani, T, Klagyivik, P, Korth, J, Kurita, S, Kusakabe, N, Livingston, J, Luque, R, Madrigal-Aguado, A, Morello, G, Nishiumi, T, Orell-Miquel, J, Oshagh, M, Śanchez-Benavente, M, Stangret, M, Terada, Y, Watanabe, N, Zou, Y, Tamura, M, Kurokawa, T, Kuzuhara, M, Nishikawa, J, Omiya, M, Vievard, S, Ueda, A, Latham, DW, Quinn, SN, Strakhov, IS, Belinski, AA, Jenkins, JM, Ricker, GR, Seager, S, Vanderspek, R, Winn, JN, Charbonneau, D, Ciardi, DR, Collins, KA, Doty, JP, Bachelet, E & Harbeck, D 2022, 'TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf', Publications of the Astronomical Society of Japan, vol. 74, no. 1, pp. L1-L8. https://doi.org/10.1093/pasj/psab106

TY - JOUR

T1 - TOI-2285b

T2 - A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

AU - Fukui, Akihiko

AU - Kimura, Tadahiro

AU - Hirano, Teruyuki

AU - Narita, Norio

AU - Kodama, Takanori

AU - Hori, Yasunori

AU - Ikoma, Masahiro

AU - Pallé, Enric

AU - Murgas, Felipe

AU - Parviainen, Hannu

AU - Kawauchi, Kiyoe

AU - Mori, Mayuko

AU - Esparza-Borges, Emma

AU - Bieryla, Allyson

AU - Irwin, Jonathan

AU - Safonov, Boris S.

AU - Stassun, Keivan G.

AU - Alvarez-Hernandez, Leticia

AU - Béjar, Víctor J.S.

AU - Casasayas-Barris, Núria

AU - Chen, Guo

AU - Crouzet, Nicolas

AU - De Leon, Jerome P.

AU - Isogai, Keisuke

AU - Kagetani, Taiki

AU - Klagyivik, Peter

AU - Korth, Judith

AU - Kurita, Seiya

AU - Kusakabe, Nobuhiko

AU - Livingston, John

AU - Luque, Rafael

AU - Madrigal-Aguado, Alberto

AU - Morello, Giuseppe

AU - Nishiumi, Taku

AU - Orell-Miquel, Jaume

AU - Oshagh, Mahmoudreza

AU - Śanchez-Benavente, Manuel

AU - Stangret, Monika

AU - Terada, Yuka

AU - Watanabe, Noriharu

AU - Zou, Yujie

AU - Tamura, Motohide

AU - Kurokawa, Takashi

AU - Kuzuhara, Masayuki

AU - Nishikawa, Jun

AU - Omiya, Masashi

AU - Vievard, Sébastien

AU - Ueda, Akitoshi

AU - Latham, David W.

AU - Quinn, Samuel N.

AU - Strakhov, Ivan S.

AU - Belinski, Alexandr A.

AU - Jenkins, Jon M.

AU - Ricker, George R.

AU - Seager, Sara

AU - Vanderspek, Roland

AU - Winn, Joshua N.

AU - Charbonneau, David

AU - Ciardi, David R.

AU - Collins, Karen A.

AU - Doty, John P.

AU - Bachelet, Etienne

AU - Harbeck, Daniel

PY - 2022/2/1

Y1 - 2022/2/1

N2 - We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

AB - We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ± 0.08, R⊕, a mass of < 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

KW - planets and satellites: detection

KW - planets and satellites: individual (TOI-2285b)

KW - planets and satellites: interiors

KW - techniques: photometric

KW - techniques: radial velocities

UR - http://www.scopus.com/inward/record.url?scp=85127203937&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85127203937&partnerID=8YFLogxK

U2 - 10.1093/pasj/psab106

DO - 10.1093/pasj/psab106

M3 - Article

AN - SCOPUS:85127203937

SN - 0004-6264

VL - 74

SP - L1-L8

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 1

ER -

TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf

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