TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert

Mayuko Mori; John H. Livingston; Jerome De Leon; Norio Narita; Teruyuki Hirano; Akihiko Fukui; Karen A. Collins; Naho Fujita; Yasunori Hori; Hiroyuki Tako Ishikawa; Kiyoe Kawauchi; Keivan G. Stassun; Noriharu Watanabe; Steven Giacalone; Rebecca Gore; Ashley Schroeder; Courtney D. Dressing; Allyson Bieryla; Eric L.N. Jensen; Bob Massey; Avi Shporer; Masayuki Kuzuhara; David Charbonneau; David R. Ciardi; John P. Doty; Emma Esparza-Borges; Hiroki Harakawa; Klaus Hodapp; Masahiro Ikoma; Kai Ikuta; Keisuke Isogai; Jon M. Jenkins; Taiki Kagetani; Tadahiro Kimura; Takanori Kodama; Takayuki Kotani; Vigneshwaran Krishnamurthy; Tomoyuki Kudo; Seiya Kurita; Takashi Kurokawa; Nobuhiko Kusakabe; David W. Latham; Brian McLean; Felipe Murgas; Jun Nishikawa; Taku Nishiumi; Masashi Omiya; Hugh P. Osborn; Enric Palle; Hannu Parviainen; George R. Ricker; Sara Seager; Takuma Serizawa; Huan Yu Teng; Yuka Terada; Joseph D. Twicken; Akitoshi Ueda; Roland Vanderspek; Sébastien Vievard; Joshua N. Winn; Yujie Zou; Motohide Tamura

doi:10.3847/1538-3881/ac6bf8

TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert

Mayuko Mori, John H. Livingston, Jerome De Leon, Norio Narita, Teruyuki Hirano, Akihiko Fukui, Karen A. Collins, Naho Fujita, Yasunori Hori, Hiroyuki Tako Ishikawa, Kiyoe Kawauchi, Keivan G. Stassun, Noriharu Watanabe, Steven Giacalone, Rebecca Gore, Ashley Schroeder, Courtney D. Dressing, Allyson Bieryla, Eric L.N. Jensen, Bob MasseyAvi Shporer, Masayuki Kuzuhara, David Charbonneau, David R. Ciardi, John P. Doty, Emma Esparza-Borges, Hiroki Harakawa, Klaus Hodapp, Masahiro Ikoma, Kai Ikuta, Keisuke Isogai, Jon M. Jenkins, Taiki Kagetani, Tadahiro Kimura, Takanori Kodama, Takayuki Kotani, Vigneshwaran Krishnamurthy, Tomoyuki Kudo, Seiya Kurita, Takashi Kurokawa, Nobuhiko Kusakabe, David W. Latham, Brian McLean, Felipe Murgas, Jun Nishikawa, Taku Nishiumi, Masashi Omiya, Hugh P. Osborn, Enric Palle, Hannu Parviainen, George R. Ricker, Sara Seager, Takuma Serizawa, Huan Yu Teng, Yuka Terada, Joseph D. Twicken, Akitoshi Ueda, Roland Vanderspek, Sébastien Vievard, Joshua N. Winn, Yujie Zou, Motohide Tamura

Astrophysical Sciences

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Abstract

We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R and an orbital period of 2.5 days, using a combination of Transiting Exoplanets Survey Satellite (TESS) and follow-up observations using ground-based telescopes. Joint analysis of multiband photometry from TESS, Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT), MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolution spectroscopy with the Subaru InfraRed Doppler (IRD) confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and Infrared Telescope Facility SpeX were used to determine the stellar parameters, and it was found that the host star is an M4 dwarf with an effective temperature of T eff = 3185 ± 76 K and a metallicity of [Fe/H] = 0.336 ± 0.060 dex. The radial velocities measured from IRD set a 2σ upper limit on the planetary mass to be 48.8 M. The large radius ratio (R p/R ∼0.1) and the relatively bright near-infrared magnitude (J = 12.2 mag) make this planet an attractive target for further follow-up observations. TOI-1696 b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST.

Original language	English (US)
Article number	298
Journal	Astronomical Journal
Volume	163
Issue number	6
DOIs	https://doi.org/10.3847/1538-3881/ac6bf8
State	Published - Jun 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ac6bf8

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Mori, M., Livingston, J. H., Leon, J. D., Narita, N., Hirano, T., Fukui, A., Collins, K. A., Fujita, N., Hori, Y., Ishikawa, H. T., Kawauchi, K., Stassun, K. G., Watanabe, N., Giacalone, S., Gore, R., Schroeder, A., Dressing, C. D., Bieryla, A., Jensen, E. L. N., ... Tamura, M. (2022). TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert. Astronomical Journal, 163(6), Article 298. https://doi.org/10.3847/1538-3881/ac6bf8

@article{fb6ddb97734248e684ae1847579ad19a,

title = "TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert",

abstract = "We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R and an orbital period of 2.5 days, using a combination of Transiting Exoplanets Survey Satellite (TESS) and follow-up observations using ground-based telescopes. Joint analysis of multiband photometry from TESS, Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT), MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolution spectroscopy with the Subaru InfraRed Doppler (IRD) confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and Infrared Telescope Facility SpeX were used to determine the stellar parameters, and it was found that the host star is an M4 dwarf with an effective temperature of T eff = 3185 ± 76 K and a metallicity of [Fe/H] = 0.336 ± 0.060 dex. The radial velocities measured from IRD set a 2σ upper limit on the planetary mass to be 48.8 M. The large radius ratio (R p/R ∼0.1) and the relatively bright near-infrared magnitude (J = 12.2 mag) make this planet an attractive target for further follow-up observations. TOI-1696 b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST.",

author = "Mayuko Mori and Livingston, {John H.} and Leon, {Jerome De} and Norio Narita and Teruyuki Hirano and Akihiko Fukui and Collins, {Karen A.} and Naho Fujita and Yasunori Hori and Ishikawa, {Hiroyuki Tako} and Kiyoe Kawauchi and Stassun, {Keivan G.} and Noriharu Watanabe and Steven Giacalone and Rebecca Gore and Ashley Schroeder and Dressing, {Courtney D.} and Allyson Bieryla and Jensen, {Eric L.N.} and Bob Massey and Avi Shporer and Masayuki Kuzuhara and David Charbonneau and Ciardi, {David R.} and Doty, {John P.} and Emma Esparza-Borges and Hiroki Harakawa and Klaus Hodapp and Masahiro Ikoma and Kai Ikuta and Keisuke Isogai and Jenkins, {Jon M.} and Taiki Kagetani and Tadahiro Kimura and Takanori Kodama and Takayuki Kotani and Vigneshwaran Krishnamurthy and Tomoyuki Kudo and Seiya Kurita and Takashi Kurokawa and Nobuhiko Kusakabe and Latham, {David W.} and Brian McLean and Felipe Murgas and Jun Nishikawa and Taku Nishiumi and Masashi Omiya and Osborn, {Hugh P.} and Enric Palle and Hannu Parviainen and Ricker, {George R.} and Sara Seager and Takuma Serizawa and Teng, {Huan Yu} and Yuka Terada and Twicken, {Joseph D.} and Akitoshi Ueda and Roland Vanderspek and S{\'e}bastien Vievard and Winn, {Joshua N.} and Yujie Zou and Motohide Tamura",

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

year = "2022",

month = jun,

day = "1",

doi = "10.3847/1538-3881/ac6bf8",

language = "English (US)",

volume = "163",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "IOP Publishing Ltd.",

number = "6",

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Mori, M, Livingston, JH, Leon, JD, Narita, N, Hirano, T, Fukui, A, Collins, KA, Fujita, N, Hori, Y, Ishikawa, HT, Kawauchi, K, Stassun, KG, Watanabe, N, Giacalone, S, Gore, R, Schroeder, A, Dressing, CD, Bieryla, A, Jensen, ELN, Massey, B, Shporer, A, Kuzuhara, M, Charbonneau, D, Ciardi, DR, Doty, JP, Esparza-Borges, E, Harakawa, H, Hodapp, K, Ikoma, M, Ikuta, K, Isogai, K, Jenkins, JM, Kagetani, T, Kimura, T, Kodama, T, Kotani, T, Krishnamurthy, V, Kudo, T, Kurita, S, Kurokawa, T, Kusakabe, N, Latham, DW, McLean, B, Murgas, F, Nishikawa, J, Nishiumi, T, Omiya, M, Osborn, HP, Palle, E, Parviainen, H, Ricker, GR, Seager, S, Serizawa, T, Teng, HY, Terada, Y, Twicken, JD, Ueda, A, Vanderspek, R, Vievard, S, Winn, JN, Zou, Y & Tamura, M 2022, 'TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert', Astronomical Journal, vol. 163, no. 6, 298. https://doi.org/10.3847/1538-3881/ac6bf8

TY - JOUR

T1 - TOI-1696

T2 - A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert

AU - Mori, Mayuko

AU - Livingston, John H.

AU - Leon, Jerome De

AU - Narita, Norio

AU - Hirano, Teruyuki

AU - Fukui, Akihiko

AU - Collins, Karen A.

AU - Fujita, Naho

AU - Hori, Yasunori

AU - Ishikawa, Hiroyuki Tako

AU - Kawauchi, Kiyoe

AU - Stassun, Keivan G.

AU - Watanabe, Noriharu

AU - Giacalone, Steven

AU - Gore, Rebecca

AU - Schroeder, Ashley

AU - Dressing, Courtney D.

AU - Bieryla, Allyson

AU - Jensen, Eric L.N.

AU - Massey, Bob

AU - Shporer, Avi

AU - Kuzuhara, Masayuki

AU - Charbonneau, David

AU - Ciardi, David R.

AU - Doty, John P.

AU - Esparza-Borges, Emma

AU - Harakawa, Hiroki

AU - Hodapp, Klaus

AU - Ikoma, Masahiro

AU - Ikuta, Kai

AU - Isogai, Keisuke

AU - Jenkins, Jon M.

AU - Kagetani, Taiki

AU - Kimura, Tadahiro

AU - Kodama, Takanori

AU - Kotani, Takayuki

AU - Krishnamurthy, Vigneshwaran

AU - Kudo, Tomoyuki

AU - Kurita, Seiya

AU - Kurokawa, Takashi

AU - Kusakabe, Nobuhiko

AU - Latham, David W.

AU - McLean, Brian

AU - Murgas, Felipe

AU - Nishikawa, Jun

AU - Nishiumi, Taku

AU - Omiya, Masashi

AU - Osborn, Hugh P.

AU - Palle, Enric

AU - Parviainen, Hannu

AU - Ricker, George R.

AU - Seager, Sara

AU - Serizawa, Takuma

AU - Teng, Huan Yu

AU - Terada, Yuka

AU - Twicken, Joseph D.

AU - Ueda, Akitoshi

AU - Vanderspek, Roland

AU - Vievard, Sébastien

AU - Winn, Joshua N.

AU - Zou, Yujie

AU - Tamura, Motohide

PY - 2022/6/1

Y1 - 2022/6/1

N2 - We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R and an orbital period of 2.5 days, using a combination of Transiting Exoplanets Survey Satellite (TESS) and follow-up observations using ground-based telescopes. Joint analysis of multiband photometry from TESS, Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT), MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolution spectroscopy with the Subaru InfraRed Doppler (IRD) confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and Infrared Telescope Facility SpeX were used to determine the stellar parameters, and it was found that the host star is an M4 dwarf with an effective temperature of T eff = 3185 ± 76 K and a metallicity of [Fe/H] = 0.336 ± 0.060 dex. The radial velocities measured from IRD set a 2σ upper limit on the planetary mass to be 48.8 M. The large radius ratio (R p/R ∼0.1) and the relatively bright near-infrared magnitude (J = 12.2 mag) make this planet an attractive target for further follow-up observations. TOI-1696 b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST.

AB - We present the discovery and validation of a temperate sub-Neptune around the nearby mid-M dwarf TIC 470381900 (TOI-1696), with a radius of 3.09 ± 0.11 R and an orbital period of 2.5 days, using a combination of Transiting Exoplanets Survey Satellite (TESS) and follow-up observations using ground-based telescopes. Joint analysis of multiband photometry from TESS, Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT), MuSCAT3, Sinistro, and KeplerCam confirmed the transit signal to be achromatic as well as refined the orbital ephemeris. High-resolution imaging with Gemini/'Alopeke and high-resolution spectroscopy with the Subaru InfraRed Doppler (IRD) confirmed that there are no stellar companions or background sources to the star. The spectroscopic observations with IRD and Infrared Telescope Facility SpeX were used to determine the stellar parameters, and it was found that the host star is an M4 dwarf with an effective temperature of T eff = 3185 ± 76 K and a metallicity of [Fe/H] = 0.336 ± 0.060 dex. The radial velocities measured from IRD set a 2σ upper limit on the planetary mass to be 48.8 M. The large radius ratio (R p/R ∼0.1) and the relatively bright near-infrared magnitude (J = 12.2 mag) make this planet an attractive target for further follow-up observations. TOI-1696 b is one of the planets belonging to the Neptunian desert with the highest transmission spectroscopy metric discovered to date, making it an interesting candidate for atmospheric characterizations with JWST.

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UR - http://www.scopus.com/inward/citedby.url?scp=85131688169&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/ac6bf8

DO - 10.3847/1538-3881/ac6bf8

M3 - Article

AN - SCOPUS:85131688169

SN - 0004-6256

VL - 163

JO - Astronomical Journal

JF - Astronomical Journal

IS - 6

M1 - 298

ER -

TOI-1696: A Nearby M4 Dwarf with a 3 R Planet in the Neptunian Desert

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