A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole

Georgina Dransfield; Mathilde Timmermans; Amaury H.M.J. Triaud; Martín Dévora-Pajares; Christian Aganze; Khalid Barkaoui; Adam J. Burgasser; Karen A. Collins; Marion Cointepas; Elsa Ducrot; Maximilian N. Günther; Steve B. Howell; Catriona A. Murray; Prajwal Niraula; Benjamin V. Rackham; Daniel Sebastian; Keivan G. Stassun; Sebastián Zúñiga-Fernández; José Manuel Almenara; Xavier Bonfils; François Bouchy; Christopher J. Burke; David Charbonneau; Jessie L. Christiansen; Laetitia Delrez; Tianjun Gan; Lionel J. García; Michaël Gillon; Yilen Gómez Maqueo Chew; Katharine M. Hesse; Matthew J. Hooton; Giovanni Isopi; Emmanuël Jehin; Jon M. Jenkins; David W. Latham; Franco Mallia; Felipe Murgas; Peter P. Pedersen; Francisco J. Pozuelos; Didier Queloz; David R. Rodriguez; Nicole Schanche; Sara Seager; Gregor Srdoc; Chris Stockdale; Joseph D. Twicken; Roland Vanderspek; Robert Wells; Joshua N. Winn; Julien de Wit; Aldo Zapparata

doi:10.1093/mnras/stad1439

A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole

Georgina Dransfield, Mathilde Timmermans, Amaury H.M.J. Triaud, Martín Dévora-Pajares, Christian Aganze, Khalid Barkaoui, Adam J. Burgasser, Karen A. Collins, Marion Cointepas, Elsa Ducrot, Maximilian N. Günther, Steve B. Howell, Catriona A. Murray, Prajwal Niraula, Benjamin V. Rackham, Daniel Sebastian, Keivan G. Stassun, Sebastián Zúñiga-Fernández, José Manuel Almenara, Xavier BonfilsFrançois Bouchy, Christopher J. Burke, David Charbonneau, Jessie L. Christiansen, Laetitia Delrez, Tianjun Gan, Lionel J. García, Michaël Gillon, Yilen Gómez Maqueo Chew, Katharine M. Hesse, Matthew J. Hooton, Giovanni Isopi, Emmanuël Jehin, Jon M. Jenkins, David W. Latham, Franco Mallia, Felipe Murgas, Peter P. Pedersen, Francisco J. Pozuelos, Didier Queloz, David R. Rodriguez, Nicole Schanche, Sara Seager, Gregor Srdoc, Chris Stockdale, Joseph D. Twicken, Roland Vanderspek, Robert Wells, Joshua N. Winn, Julien de Wit, Aldo Zapparata

Astrophysical Sciences

Princeton University

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

Abstract

A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, a R_b = 1.55 ± 0.06R planet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a period P_b = 19.288004⁺₋₀⁰₀₀₀₀₂₄⁰⁰⁰⁰²⁷ d. TOI-715 b was first identified by TESS and validated using ground-based photometry, high-resolution imaging and statistical validation. The planet’s orbital period combined with the stellar effective temperature T_eff = 3075 ± 75 K give this planet an installation S_b = 0.67⁺₋₀⁰₂₀¹⁵ S, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b’s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period of P₀₂ = 25.60712⁺₋₀⁰₀₀₀₃₆⁰⁰⁰³¹ d and a radius of R₀₂ = 1.066 ± 0.092 R, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered by TESS to date.

Original language	American English
Pages (from-to)	35-52
Number of pages	18
Journal	Monthly Notices of the Royal Astronomical Society
Volume	527
Issue number	1
DOIs	https://doi.org/10.1093/mnras/stad1439
State	Published - Jan 1 2024

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Keywords

planets
planets and satellites: detection
planets and satellites: fundamental parameters
satellites: terrestrial planets

Access to Document

10.1093/mnras/stad1439

Cite this

Dransfield, G., Timmermans, M., Triaud, A. H. M. J., Dévora-Pajares, M., Aganze, C., Barkaoui, K., Burgasser, A. J., Collins, K. A., Cointepas, M., Ducrot, E., Günther, M. N., Howell, S. B., Murray, C. A., Niraula, P., Rackham, B. V., Sebastian, D., Stassun, K. G., Zúñiga-Fernández, S., Almenara, J. M., ... Zapparata, A. (2024). A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole. Monthly Notices of the Royal Astronomical Society, 527(1), 35-52. https://doi.org/10.1093/mnras/stad1439

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title = "A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole",

abstract = "A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, a Rb = 1.55 ± 0.06R planet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a period Pb = 19.288004+−00000024000027 d. TOI-715 b was first identified by TESS and validated using ground-based photometry, high-resolution imaging and statistical validation. The planet{\textquoteright}s orbital period combined with the stellar effective temperature Teff = 3075 ± 75 K give this planet an installation Sb = 0.67+−002015 S, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b{\textquoteright}s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period of P02 = 25.60712+−000003600031 d and a radius of R02 = 1.066 ± 0.092 R, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered by TESS to date.",

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author = "Georgina Dransfield and Mathilde Timmermans and Triaud, {Amaury H.M.J.} and Mart{\'i}n D{\'e}vora-Pajares and Christian Aganze and Khalid Barkaoui and Burgasser, {Adam J.} and Collins, {Karen A.} and Marion Cointepas and Elsa Ducrot and G{\"u}nther, {Maximilian N.} and Howell, {Steve B.} and Murray, {Catriona A.} and Prajwal Niraula and Rackham, {Benjamin V.} and Daniel Sebastian and Stassun, {Keivan G.} and Sebasti{\'a}n Z{\'u}{\~n}iga-Fern{\'a}ndez and Almenara, {Jos{\'e} Manuel} and Xavier Bonfils and Fran{\c c}ois Bouchy and Burke, {Christopher J.} and David Charbonneau and Christiansen, {Jessie L.} and Laetitia Delrez and Tianjun Gan and Garc{\'i}a, {Lionel J.} and Micha{\"e}l Gillon and {Maqueo Chew}, {Yilen G{\'o}mez} and Hesse, {Katharine M.} and Hooton, {Matthew J.} and Giovanni Isopi and Emmanu{\"e}l Jehin and Jenkins, {Jon M.} and Latham, {David W.} and Franco Mallia and Felipe Murgas and Pedersen, {Peter P.} and Pozuelos, {Francisco J.} and Didier Queloz and Rodriguez, {David R.} and Nicole Schanche and Sara Seager and Gregor Srdoc and Chris Stockdale and Twicken, {Joseph D.} and Roland Vanderspek and Robert Wells and Winn, {Joshua N.} and {de Wit}, Julien and Aldo Zapparata",

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year = "2024",

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day = "1",

doi = "10.1093/mnras/stad1439",

language = "American English",

volume = "527",

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Dransfield, G, Timmermans, M, Triaud, AHMJ, Dévora-Pajares, M, Aganze, C, Barkaoui, K, Burgasser, AJ, Collins, KA, Cointepas, M, Ducrot, E, Günther, MN, Howell, SB, Murray, CA, Niraula, P, Rackham, BV, Sebastian, D, Stassun, KG, Zúñiga-Fernández, S, Almenara, JM, Bonfils, X, Bouchy, F, Burke, CJ, Charbonneau, D, Christiansen, JL, Delrez, L, Gan, T, García, LJ, Gillon, M, Maqueo Chew, YG, Hesse, KM, Hooton, MJ, Isopi, G, Jehin, E, Jenkins, JM, Latham, DW, Mallia, F, Murgas, F, Pedersen, PP, Pozuelos, FJ, Queloz, D, Rodriguez, DR, Schanche, N, Seager, S, Srdoc, G, Stockdale, C, Twicken, JD, Vanderspek, R, Wells, R, Winn, JN, de Wit, J & Zapparata, A 2024, 'A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole', Monthly Notices of the Royal Astronomical Society, vol. 527, no. 1, pp. 35-52. https://doi.org/10.1093/mnras/stad1439

TY - JOUR

T1 - A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole

AU - Dransfield, Georgina

AU - Timmermans, Mathilde

AU - Triaud, Amaury H.M.J.

AU - Dévora-Pajares, Martín

AU - Aganze, Christian

AU - Barkaoui, Khalid

AU - Burgasser, Adam J.

AU - Collins, Karen A.

AU - Cointepas, Marion

AU - Ducrot, Elsa

AU - Günther, Maximilian N.

AU - Howell, Steve B.

AU - Murray, Catriona A.

AU - Niraula, Prajwal

AU - Rackham, Benjamin V.

AU - Sebastian, Daniel

AU - Stassun, Keivan G.

AU - Zúñiga-Fernández, Sebastián

AU - Almenara, José Manuel

AU - Bonfils, Xavier

AU - Bouchy, François

AU - Burke, Christopher J.

AU - Charbonneau, David

AU - Christiansen, Jessie L.

AU - Delrez, Laetitia

AU - Gan, Tianjun

AU - García, Lionel J.

AU - Gillon, Michaël

AU - Maqueo Chew, Yilen Gómez

AU - Hesse, Katharine M.

AU - Hooton, Matthew J.

AU - Isopi, Giovanni

AU - Jehin, Emmanuël

AU - Jenkins, Jon M.

AU - Latham, David W.

AU - Mallia, Franco

AU - Murgas, Felipe

AU - Pedersen, Peter P.

AU - Pozuelos, Francisco J.

AU - Queloz, Didier

AU - Rodriguez, David R.

AU - Schanche, Nicole

AU - Seager, Sara

AU - Srdoc, Gregor

AU - Stockdale, Chris

AU - Twicken, Joseph D.

AU - Vanderspek, Roland

AU - Wells, Robert

AU - Winn, Joshua N.

AU - de Wit, Julien

AU - Zapparata, Aldo

PY - 2024/1/1

Y1 - 2024/1/1

N2 - A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, a Rb = 1.55 ± 0.06R planet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a period Pb = 19.288004+−00000024000027 d. TOI-715 b was first identified by TESS and validated using ground-based photometry, high-resolution imaging and statistical validation. The planet’s orbital period combined with the stellar effective temperature Teff = 3075 ± 75 K give this planet an installation Sb = 0.67+−002015 S, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b’s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period of P02 = 25.60712+−000003600031 d and a radius of R02 = 1.066 ± 0.092 R, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered by TESS to date.

AB - A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biological and geological processes. Now is therefore the time to identify the most unique planets to be characterized with these instruments. In this context, we report on the discovery and validation of TOI-715 b, a Rb = 1.55 ± 0.06R planet orbiting its nearby (42 pc) M4 host (TOI-715/TIC 271971130) with a period Pb = 19.288004+−00000024000027 d. TOI-715 b was first identified by TESS and validated using ground-based photometry, high-resolution imaging and statistical validation. The planet’s orbital period combined with the stellar effective temperature Teff = 3075 ± 75 K give this planet an installation Sb = 0.67+−002015 S, placing it within the most conservative definitions of the habitable zone for rocky planets. TOI-715 b’s radius falls exactly between two measured locations of the M-dwarf radius valley; characterizing its mass and composition will help understand the true nature of the radius valley for low-mass stars. We demonstrate TOI-715 b is amenable for characterization using precise radial velocities and transmission spectroscopy. Additionally, we reveal a second candidate planet in the system, TIC 271971130.02, with a potential orbital period of P02 = 25.60712+−000003600031 d and a radius of R02 = 1.066 ± 0.092 R, just inside the outer boundary of the habitable zone, and near a 4:3 orbital period commensurability. Should this second planet be confirmed, it would represent the smallest habitable zone planet discovered by TESS to date.

KW - planets

KW - planets and satellites: detection

KW - planets and satellites: fundamental parameters

KW - satellites: terrestrial planets

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JF - Monthly Notices of the Royal Astronomical Society

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A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole

Abstract

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Keywords

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