Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System

Teruyuki Hirano; Eric Gaidos; Joshua N. Winn; Fei Dai; Akihiko Fukui; Masayuki Kuzuhara; Takayuki Kotani; Motohide Tamura; Maria Hjorth; Simon Albrecht; Daniel Huber; Emeline Bolmont; Hiroki Harakawa; Klaus Hodapp; Masato Ishizuka; Shane Jacobson; Mihoko Konishi; Tomoyuki Kudo; Takashi Kurokawa; Jun Nishikawa; Masashi Omiya; Takuma Serizawa; Akitoshi Ueda; Lauren M. Weiss

doi:10.3847/2041-8213/ab74dc

Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System

Teruyuki Hirano, Eric Gaidos, Joshua N. Winn, Fei Dai, Akihiko Fukui, Masayuki Kuzuhara, Takayuki Kotani, Motohide Tamura, Maria Hjorth, Simon Albrecht, Daniel Huber, Emeline Bolmont, Hiroki Harakawa, Klaus Hodapp, Masato Ishizuka, Shane Jacobson, Mihoko Konishi, Tomoyuki Kudo, Takashi Kurokawa, Jun NishikawaMasashi Omiya, Takuma Serizawa, Akitoshi Ueda, Lauren M. Weiss

Institut for Fysik og Astronomi - Stellar Astrophysics Centre

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

Abstract

In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ = 19± ¹³ ₁₅. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

Originalsprog	Engelsk
Artikelnummer	L27
Tidsskrift	Astrophysical Journal Letters
Vol/bind	890
Nummer	2
Antal sider	7
ISSN	2041-8205
DOI	https://doi.org/10.3847/2041-8213/ab74dc
Status	Udgivet - 2020

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10.3847/2041-8213/ab74dc

https://arxiv.org/pdf/2002.05892.pdf

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Hirano, T., Gaidos, E., Winn, J. N., Dai, F., Fukui, A., Kuzuhara, M., Kotani, T., Tamura, M., Hjorth, M., Albrecht, S., Huber, D., Bolmont, E., Harakawa, H., Hodapp, K., Ishizuka, M., Jacobson, S., Konishi, M., Kudo, T., Kurokawa, T., ... Weiss, L. M. (2020). Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System. Astrophysical Journal Letters, 890(2), Artikel L27. https://doi.org/10.3847/2041-8213/ab74dc

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title = "Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System",

abstract = "In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the {"}Doppler shadow{"} of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ = 19± 13 15. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.",

author = "Teruyuki Hirano and Eric Gaidos and Winn, {Joshua N.} and Fei Dai and Akihiko Fukui and Masayuki Kuzuhara and Takayuki Kotani and Motohide Tamura and Maria Hjorth and Simon Albrecht and Daniel Huber and Emeline Bolmont and Hiroki Harakawa and Klaus Hodapp and Masato Ishizuka and Shane Jacobson and Mihoko Konishi and Tomoyuki Kudo and Takashi Kurokawa and Jun Nishikawa and Masashi Omiya and Takuma Serizawa and Akitoshi Ueda and Weiss, {Lauren M.}",

year = "2020",

doi = "10.3847/2041-8213/ab74dc",

language = "English",

volume = "890",

journal = "Astrophysical Journal Letters",

issn = "2041-8205",

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Hirano, T, Gaidos, E, Winn, JN, Dai, F, Fukui, A, Kuzuhara, M, Kotani, T, Tamura, M, Hjorth, M, Albrecht, S, Huber, D, Bolmont, E, Harakawa, H, Hodapp, K, Ishizuka, M, Jacobson, S, Konishi, M, Kudo, T, Kurokawa, T, Nishikawa, J, Omiya, M, Serizawa, T, Ueda, A & Weiss, LM 2020, 'Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System', Astrophysical Journal Letters, bind 890, nr. 2, L27. https://doi.org/10.3847/2041-8213/ab74dc

TY - JOUR

T1 - Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System

AU - Hirano, Teruyuki

AU - Gaidos, Eric

AU - Winn, Joshua N.

AU - Dai, Fei

AU - Fukui, Akihiko

AU - Kuzuhara, Masayuki

AU - Kotani, Takayuki

AU - Tamura, Motohide

AU - Hjorth, Maria

AU - Albrecht, Simon

AU - Huber, Daniel

AU - Bolmont, Emeline

AU - Harakawa, Hiroki

AU - Hodapp, Klaus

AU - Ishizuka, Masato

AU - Jacobson, Shane

AU - Konishi, Mihoko

AU - Kudo, Tomoyuki

AU - Kurokawa, Takashi

AU - Nishikawa, Jun

AU - Omiya, Masashi

AU - Serizawa, Takuma

AU - Ueda, Akitoshi

AU - Weiss, Lauren M.

PY - 2020

Y1 - 2020

N2 - In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ = 19± 13 15. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

AB - In an effort to measure the Rossiter-McLaughlin effect for the TRAPPIST-1 system, we performed high-resolution spectroscopy during transits of planets e, f, and b. The spectra were obtained with the InfraRed Doppler spectrograph on the Subaru 8.2 m telescope, and were supplemented with simultaneous photometry obtained with a 1 m telescope of the Las Cumbres Observatory Global Telescope. By analyzing the anomalous radial velocities, we found the projected stellar obliquity to be λ = 1 ± 28° under the assumption that the three planets have coplanar orbits, although we caution that the radial-velocity data show correlated noise of unknown origin. We also sought evidence for the expected deformations of the stellar absorption lines, and thereby detected the "Doppler shadow" of planet b with a false-alarm probability of 1.7%. The joint analysis of the observed residual cross-correlation map including the three transits gave λ = 19± 13 15. These results indicate that the the TRAPPIST-1 star is not strongly misaligned with the common orbital plane of the planets, although further observations are encouraged to verify this conclusion.

UR - http://www.scopus.com/inward/record.url?scp=85081669105&partnerID=8YFLogxK

U2 - 10.3847/2041-8213/ab74dc

DO - 10.3847/2041-8213/ab74dc

M3 - Journal article

AN - SCOPUS:85081669105

SN - 2041-8205

VL - 890

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L27

ER -

Evidence for Spin-Orbit Alignment in the TRAPPIST-1 System

Abstract

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