KFU. Card publication. SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/eROSITA + ZTF Search

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SRGEJ045359.9+622444: A 55 MINUTE PERIOD ECLIPSING AM CANUM VENATICORUM STAR DISCOVERED FROM A JOINT SRG/EROSITA + ZTF SEARCH

Form of presentation

Articles in international journals and collections

Year of publication

2023

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Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Galiullin Ilkham Irekovich, author

Gumerov Rustam Iskhakovich, author

Sklyanov Aleksandr Sergeevich, author

Bibliographic description in the original language

Rodriguez A.C, Galiullin I, Gilfanov M, SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/eROSITA + ZTF Search//Astrophysical Journal. - 2023. - Vol.954, Is.1. - Art. �63.

Annotation

AM Canum Venaticorum (AM CVn) systems are ultracompact binaries where a white dwarf accretes from a helium-rich degenerate or semidegenerate donor. Some AM CVn systems will be among the loudest sources of gravitational waves for the upcoming Laser Interferometer Space Antenna; yet the formation channel of AM CVns remains uncertain. We report the study and characterization of a new eclipsing AM CVn, SRGeJ045359.9 +622444 (hereafter, SRGeJ0453), discovered from a joint Spektrum-Roentgen-Gamma (SRG) Extended Roentgen Survey with an Imaging Telescope Array (eROSITA) mission and Zwicky Transient Facility program to identify cataclysmic variables (CVs). We obtained optical photometry to confirm the eclipse of SRGeJ0453 and determine the orbital period to be Porb = 55.0802  0.0003 min. We constrain the binary parameters by modeling the highspeed photometry and radial-velocity curves and find Mdonor = 0.044 ? 0.024Me and Rdonor = 0.078 ? 0.012Re. The X-ray spectrum is approximated by a power-law model with an unusually flat photon index of Γ ∼ 1 previously seen in magnetic CVs with SRG/eROSITA, but verifying that the magnetic nature of SRGeJ0453 requires further investigation. Optical spectroscopy suggests that the donor star of SRGeJ0453 could have initially been a He star or a He white dwarf. SRGeJ0453 is the ninth eclipsing AM CVn system published to date, and its lack of optical outbursts have made it elusive in previous surveys. The discovery of SRGeJ0453 using joint X-ray and optical surveys highlights the potential for discovering similar systems in the near future.

Keywords

Cataclysmic variable stars, AM Canum Venaticorum stars, X-ray identification, X-ray surveys; Time domain astronomy; Binary stars

The name of the journal

Astrophysical Journal

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85170518104&doi=10.3847%2f1538-4357%2face698&partnerID=40&md5=3354f9f0e6b30044020a386b20e99de3

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=286464&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.contributor.author	Galiullin Ilkham Irekovich	ru_RU
dc.contributor.author	Gumerov Rustam Iskhakovich	ru_RU
dc.contributor.author	Sklyanov Aleksandr Sergeevich	ru_RU
dc.date.accessioned	2023-01-01T00:00:00Z	ru_RU
dc.date.available	2023-01-01T00:00:00Z	ru_RU
dc.date.issued	2023	ru_RU
dc.identifier.citation	Rodriguez A.C, Galiullin I, Gilfanov M, SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/eROSITA + ZTF Search//Astrophysical Journal. - 2023. - Vol.954, Is.1. - Art. �63.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=286464&p_lang=2	ru_RU
dc.description.abstract	Astrophysical Journal	ru_RU
dc.description.abstract	AM Canum Venaticorum (AM CVn) systems are ultracompact binaries where a white dwarf accretes from a helium-rich degenerate or semidegenerate donor. Some AM CVn systems will be among the loudest sources of gravitational waves for the upcoming Laser Interferometer Space Antenna; yet the formation channel of AM CVns remains uncertain. We report the study and characterization of a new eclipsing AM CVn, SRGeJ045359.9 +622444 (hereafter, SRGeJ0453), discovered from a joint Spektrum-Roentgen-Gamma (SRG) Extended Roentgen Survey with an Imaging Telescope Array (eROSITA) mission and Zwicky Transient Facility program to identify cataclysmic variables (CVs). We obtained optical photometry to confirm the eclipse of SRGeJ0453 and determine the orbital period to be Porb = 55.0802  0.0003 min. We constrain the binary parameters by modeling the highspeed photometry and radial-velocity curves and find Mdonor = 0.044 ? 0.024Me and Rdonor = 0.078 ? 0.012Re. The X-ray spectrum is approximated by a power-law model with an unusually flat photon index of Γ ∼ 1 previously seen in magnetic CVs with SRG/eROSITA, but verifying that the magnetic nature of SRGeJ0453 requires further investigation. Optical spectroscopy suggests that the donor star of SRGeJ0453 could have initially been a He star or a He white dwarf. SRGeJ0453 is the ninth eclipsing AM CVn system published to date, and its lack of optical outbursts have made it elusive in previous surveys. The discovery of SRGeJ0453 using joint X-ray and optical surveys highlights the potential for discovering similar systems in the near future.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Cataclysmic variable stars	ru_RU
dc.subject	AM Canum Venaticorum stars	ru_RU
dc.subject	X-ray identification	ru_RU
dc.subject	X-ray surveys; Time domain astronomy; Binary stars	ru_RU
dc.title	SRGeJ045359.9+622444: A 55 Minute Period Eclipsing AM Canum Venaticorum Star Discovered from a Joint SRG/eROSITA + ZTF Search	ru_RU
dc.type	Articles in international journals and collections	ru_RU