Discovery of optical and infrared accretion disc wind signatures in the black hole candidate MAXI J1348 630
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-08-10
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en
Pages
9
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Astronomy and Astrophysics, Volume 664
Abstract
MAXI J1348 630 is a low mass X-ray binary discovered in 2019 during a bright outburst. During this event, the system experienced both hard and soft states following the standard evolution. We present multi-epoch optical and near-infrared spectroscopy obtained with X-shooter at the Very Large Telescope. Our dataset includes spectra taken during the brightest phases of the outburst as well as the decay towards quiescence. We study the evolution of the main emission lines, paying special attention to the presence of features commonly associated with accretion disc winds, such as blueshifted absorptions, broad emission line wings and flat-top profiles. We find broad emission line wings in Hα during the hard-to-soft transition and blueshifted absorption troughs at 500 km s 1 in Hβ, He I 5876, Hα and Paβ during the bright soft-intermediate state. In addition, flat-top profiles are seen throughout the outburst. We interpret these observables as signatures of a cold (i.e., optical-to-infrared) accretion disc wind present in the system. We discuss the properties of the wind and compare them with those seen in other X-ray transients. In particular, the wind velocity that we observe is low when compared to those of other systems, which might be a direct consequence of the relatively low binary inclination, as suggested by several observables. This study strengthens the hypothesis that cold winds are a common feature in low mass X-ray binaries and that they can also be detected in low inclination objects via high-quality optical and infrared spectroscopy.Description
Funding Information: We are thankful to the anonymous referee for constructive comments that have improved this paper. DMS and MAP acknowledge support from the Consejería de Economía, Conocimiento y Empleo del Gobierno de Canarias and the European Regional Development Fund (ERDF) under grant with reference ProID2020010104 and ProID2021010132. TMD and MAPT acknowledge support via the Ramón y Cajal Fellowships RYC-2015-18148 and RYC-2015-17854, respectively. KIIK acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 101002352) and from the Academy of Finland projects 320045 and 320085. GP acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 865637). This work has been supported in part by the Spanish Ministry of Science under grants AYA2017-83216-P, PID2020-120323GB-I00 and EUR2021-122010. MOLLY software developed by Tom Marsh is gratefully acknowledged. Based on observations collected at the European Southern Observatory under ESO programmes 0102.D-0309(A) and 0102.D-0799(A). This research has made use of MAXI data provided by RIKEN, JAXA and the MAXI team. Publisher Copyright: © G. Panizo-Espinar et al. 2022.
Keywords
Accretion, accretion disks, Binaries: close, Stars: individual: MAXI J1348 630, Stars: winds, outflows, X-rays: binaries
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Panizo-Espinar, G, Armas Padilla, M, Muñoz-Darias, T, Koljonen, K I I, Cúneo, V A, Sánchez-Sierras, J, Mata Sánchez, D, Casares, J, Corral-Santana, J, Fender, R P, Jiménez-Ibarra, F, Ponti, G, Steeghs, D & Torres, M A P 2022, ' Discovery of optical and infrared accretion disc wind signatures in the black hole candidate MAXI J1348 630 ', Astronomy and Astrophysics, vol. 664, A100 . https://doi.org/10.1051/0004-6361/202243426