CSS161010: a luminous, fast blue optical transient with broad blueshifted hydrogen lines
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2024
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| author | Gutiérrez, Claudia P. Mattila, Seppo Lundqvist, Peter Dessart, Luc González-Gaitán, Santiago Jonker, Peter G. Dong, Subo Coppejans, Deanne Chen, Ping Charalampopoulos, Panos Elias-Rosa, Nancy Reynolds, Thomas Kochanek, Christopher Fraser, Morgan Pastorello, Andrea Gromadzki, Mariusz Neustadt, Jack Benetti, Stefano Kankare, Erkki Kangas, Tuomas Kotak, Rubina Stritzinger, Maximilian D. Wevers, Thomas Zhang, Bing Bersier, David Bose, Subhash Buckley, David A. H. Dastidar, Raya Gangopadhyay, Anjasha Hamanowicz, Aleksandra Kollmeier, Juna Mao, Jirong Misra, Kuntal Potter, Stephen B. Prieto, Jose L. Romero-Colmenero, Encarni Singh, Mridweeka Somero, Auni Terreran, Giacomo Vaisanen, Petri Wyrzykowski, Lukasz |
| author_facet | Gutiérrez, Claudia P. Mattila, Seppo Lundqvist, Peter Dessart, Luc González-Gaitán, Santiago Jonker, Peter G. Dong, Subo Coppejans, Deanne Chen, Ping Charalampopoulos, Panos Elias-Rosa, Nancy Reynolds, Thomas Kochanek, Christopher Fraser, Morgan Pastorello, Andrea Gromadzki, Mariusz Neustadt, Jack Benetti, Stefano Kankare, Erkki Kangas, Tuomas Kotak, Rubina Stritzinger, Maximilian D. Wevers, Thomas Zhang, Bing Bersier, David Bose, Subhash Buckley, David A. H. Dastidar, Raya Gangopadhyay, Anjasha Hamanowicz, Aleksandra Kollmeier, Juna Mao, Jirong Misra, Kuntal Potter, Stephen B. Prieto, Jose L. Romero-Colmenero, Encarni Singh, Mridweeka Somero, Auni Terreran, Giacomo Vaisanen, Petri Wyrzykowski, Lukasz |
| contents | We present ultraviolet, optical and near-infrared photometric and optical spectroscopic observations of the luminous, fast blue optical transient (LFBOT), CSS161010:045834-081803 (CSS161010). The transient was found in a low-redshift (z=0.033) dwarf galaxy. The light curves of CSS161010 are characterized by an extremely fast evolution and blue colours. The V-band light curve shows that CSS161010 reaches an absolute peak of M$_{V}^{max}=-20.66\pm0.06$ mag in 3.8 days from the start of the outburst. After maximum, CSS161010 follows a power-law decline $\propto t^{-2.8\pm0.1}$ in all optical bands. These photometric properties are comparable to those of well-observed LFBOTs such as AT 2018cow, AT 2020mrf and AT 2020xnd. However, unlike these objects, the spectra of CSS161010 show a remarkable transformation from a blue and featureless continuum to spectra dominated by very broad, entirely blueshifted hydrogen emission lines of velocities of up to 10% of the speed of light. The persistent blueshifted emission and the lack of any emission at the rest wavelength of CSS161010 are unique features not seen in any transient before CSS161010. The combined observational properties of CSS161010 and its M$_{*}\sim10^{8}$ M$_\odot$ dwarf galaxy host favour the tidal disruption of a star by an intermediate-mass black hole as its origin. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_04698 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CSS161010: a luminous, fast blue optical transient with broad blueshifted hydrogen lines Gutiérrez, Claudia P. Mattila, Seppo Lundqvist, Peter Dessart, Luc González-Gaitán, Santiago Jonker, Peter G. Dong, Subo Coppejans, Deanne Chen, Ping Charalampopoulos, Panos Elias-Rosa, Nancy Reynolds, Thomas Kochanek, Christopher Fraser, Morgan Pastorello, Andrea Gromadzki, Mariusz Neustadt, Jack Benetti, Stefano Kankare, Erkki Kangas, Tuomas Kotak, Rubina Stritzinger, Maximilian D. Wevers, Thomas Zhang, Bing Bersier, David Bose, Subhash Buckley, David A. H. Dastidar, Raya Gangopadhyay, Anjasha Hamanowicz, Aleksandra Kollmeier, Juna Mao, Jirong Misra, Kuntal Potter, Stephen B. Prieto, Jose L. Romero-Colmenero, Encarni Singh, Mridweeka Somero, Auni Terreran, Giacomo Vaisanen, Petri Wyrzykowski, Lukasz High Energy Astrophysical Phenomena We present ultraviolet, optical and near-infrared photometric and optical spectroscopic observations of the luminous, fast blue optical transient (LFBOT), CSS161010:045834-081803 (CSS161010). The transient was found in a low-redshift (z=0.033) dwarf galaxy. The light curves of CSS161010 are characterized by an extremely fast evolution and blue colours. The V-band light curve shows that CSS161010 reaches an absolute peak of M$_{V}^{max}=-20.66\pm0.06$ mag in 3.8 days from the start of the outburst. After maximum, CSS161010 follows a power-law decline $\propto t^{-2.8\pm0.1}$ in all optical bands. These photometric properties are comparable to those of well-observed LFBOTs such as AT 2018cow, AT 2020mrf and AT 2020xnd. However, unlike these objects, the spectra of CSS161010 show a remarkable transformation from a blue and featureless continuum to spectra dominated by very broad, entirely blueshifted hydrogen emission lines of velocities of up to 10% of the speed of light. The persistent blueshifted emission and the lack of any emission at the rest wavelength of CSS161010 are unique features not seen in any transient before CSS161010. The combined observational properties of CSS161010 and its M$_{*}\sim10^{8}$ M$_\odot$ dwarf galaxy host favour the tidal disruption of a star by an intermediate-mass black hole as its origin. |
| title | CSS161010: a luminous, fast blue optical transient with broad blueshifted hydrogen lines |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.04698 |