Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis

Tomoyoshi, Mio; Masuda, Kento; Hirano, Teruyuki; Kasagi, Yui; Kawahara, Hajime; Kotani, Takayuki; Kudo, Tomoyuki; Tamura, Motohide; Vievard, Sébastien

doi:https://doi.org/10.3847/1538-4357/ad8cdd

Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis

Tomoyoshi, Mio; Masuda, Kento; Hirano, Teruyuki et al.

Astrophysical Journal, 2024, 977(2), 151

Number of Access:483（2025-09-08 09:41 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/100604

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Title	Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis
Creator	CreatorName Tomoyoshi, Mio
	NRID 1000020874168 1000020874168 ORCID 0000-0003-1298-9699 0000-0003-1298-9699 researchmap permalink kemasuda kemasuda Scopus Author ID 55440754800 55440754800 CreatorName Masuda, Kento
	NRID 1000010727449 1000010727449 CreatorName Hirano, Teruyuki
	NRID 1000051001739 1000051001739 CreatorName Kasagi, Yui
	NRID 1000090649758 1000090649758 CreatorName Kawahara, Hajime
	NRID 1000040554291 1000040554291 CreatorName Kotani, Takayuki
	CreatorName Kudo, Tomoyuki
	NRID 1000000260018 1000000260018 CreatorName Tamura, Motohide
	CreatorName Vievard, Sébastien
Description	Tomoyoshi M., Masuda K., Hirano T., et al. Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis. Astrophysical Journal 977, 151 (2024); https://doi.org/10.3847/1538-4357/ad8cdd.
Abstract	In single-lined spectroscopic binaries (SB1s) where flux variations due to tidal deformation of the primary star (ellipsoidal variations, EVs) are detected, the binary mass can be determined by combining EVs with the primary's radial velocity (RV) variations from orbital motion and information about the primary’s radius. This method has been used for mass estimation in close binaries including X-ray systems, but it has been pointed out that contaminating light from sources other than the primary star could introduce systematic errors in the mass and inclination estimates. Here, we focus on the apparent RV variations caused by asymmetric distortion of the absorption lines of the tidally deformed primary star (tidal RV). Because this signal contains information equivalent to that from photometric EVs, it enables mass estimation of the binary system using only the primary star’s absorption lines from high-resolution spectroscopic data, providing a potentially more robust approach against contaminating light. We apply the method to the binary system V723 Monocerotis, where both photometric EV and tidal RV signals are detected and successfully determine the component masses using only the primary star’s RVs and projected rotational velocity, without relying on absolute flux measurements or stellar evolutionary models. The masses derived from the tidal RV model shows a reasonable agreement with those obtained from EVs after carefully modeling the flux contamination from the secondary. This result demonstrates that tidal RVs provide a useful alternative means for mass estimation in SB1s.
Publisher	Institute of Physics
Source Title	Astrophysical Journal
Volume (Issue)	977(2)
Page	151
Date of Issued	2024-12-01
Language	English
Handle URL	https://hdl.handle.net/11094/100604
PISSN	0004637X
eISSN	15384357
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.3847/1538-4357/ad8cdd
Access Rights	open access
CopyRight	This article is licensed under a Creative Commons Attribution 4.0 International License.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCTERMS.bibliographicCitation	Astrophysical Journal. 2024, 977(2), p. 151
DC.title	Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis
DC.creator	Tomoyoshi, Mio
	Masuda, Kento
	Hirano, Teruyuki
	Kasagi, Yui
	Kawahara, Hajime
	Kotani, Takayuki
	Kudo, Tomoyuki
	Tamura, Motohide
	Vievard, Sébastien
DC.publisher	Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-12-01
DC.identifier	https://doi.org/10.3847/1538-4357/ad8cdd
DC.description	Tomoyoshi M., Masuda K., Hirano T., et al. Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis. Astrophysical Journal 977, 151 (2024); https://doi.org/10.3847/1538-4357/ad8cdd.
DCTERMS.abstract	In single-lined spectroscopic binaries (SB1s) where flux variations due to tidal deformation of the primary star (ellipsoidal variations, EVs) are detected, the binary mass can be determined by combining EVs with the primary's radial velocity (RV) variations from orbital motion and information about the primary’s radius. This method has been used for mass estimation in close binaries including X-ray systems, but it has been pointed out that contaminating light from sources other than the primary star could introduce systematic errors in the mass and inclination estimates. Here, we focus on the apparent RV variations caused by asymmetric distortion of the absorption lines of the tidally deformed primary star (tidal RV). Because this signal contains information equivalent to that from photometric EVs, it enables mass estimation of the binary system using only the primary star’s absorption lines from high-resolution spectroscopic data, providing a potentially more robust approach against contaminating light. We apply the method to the binary system V723 Monocerotis, where both photometric EV and tidal RV signals are detected and successfully determine the component masses using only the primary star’s RVs and projected rotational velocity, without relying on absolute flux measurements or stellar evolutionary models. The masses derived from the tidal RV model shows a reasonable agreement with those obtained from EVs after carefully modeling the flux contamination from the secondary. This result demonstrates that tidal RVs provide a useful alternative means for mass estimation in SB1s.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	100604
citation_title	Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis
citation_author	Tomoyoshi, Mio
	Masuda, Kento
	Hirano, Teruyuki
	Kasagi, Yui
	Kawahara, Hajime
	Kotani, Takayuki
	Kudo, Tomoyuki
	Tamura, Motohide
	Vievard, Sébastien
citation_publisher	Institute of Physics
citation_language	English
citation_date	2024-12-01
citation_journal_title	Astrophysical Journal
citation_volume	977
citation_issue	2
citation_firstpage	151
citation_doi	https://doi.org/10.3847/1538-4357/ad8cdd
citation_public_url	https://hdl.handle.net/11094/100604

Weighing Single-lined Spectroscopic Binaries Using Tidal Effects on Radial Velocities: The Case of V723 Monocerotis

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