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| Format: | Preprint |
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2026
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| Online Access: | https://arxiv.org/abs/2601.03337 |
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| author | Perley, Daniel A. Ho, Anna Y. Q. McGrath, Zoë Camilo, Michael Sevilla, Cassie Chen, Ping Schroeder, Genevieve Govreen-Segal, Taya Bochenek, Aleksandra Qin, Yu-Jing Gillanders, James H. Amend, Benjamin Anderson, Joseph P. Andreoni, Igor Aryan, Amar Bellm, Eric C. Bloom, Joshua S. de Boer, Thomas Carney, Jonathan Caiazzo, Ilaria Chambers, Ken C. Charalampopoulos, Panos Chen, Ting-Wan Chen, Tracy X. Coughlin, Eric R. Coughlin, Michael Dennefeld, Michel Dimitriadis, Georgios Fremling, Christoffer Frostig, Danielle Gal-Yam, Avishay Galbany, Lluís Gangopadhyay, Anjashay Ghendrih, Melzie Graham, Matthew J. Gromadzki, Mariusz Groom, Steven L. Gutiérrez, Claudia P. Hinds, K. -Ryan Huber, Mark E. Inserra, Cosimo Kaiser, Benjamin C. Kasliwal, Mansi M. Koivisto, Niilo E. Lin, Chien-Cheng Liu, Chang Lowe, Thomas B. Magnier, Eugene Mahabal, Ashish A. Milligan, Andrew Minguez, Paloma Mo, Geoffrey Müller-Bravo, Tomás E. Nicholl, Matt Pessi, Priscila J. Pignata, Giuliano Purdum, Josiah Rehemtulla, Nabeel Rich, R. Michael Sahu, Anwesha Singh, Avinash Smartt, Stephen J. Sollerman, Jesper Srinivasaragavan, Gokul Srivastav, Shubham Stein, Robert D. Schulze, Steve Tweddle, Jack W. Wainscoat, Richard Wise, Jacob L. Yan, Lin Young, David R. |
| author_facet | Perley, Daniel A. Ho, Anna Y. Q. McGrath, Zoë Camilo, Michael Sevilla, Cassie Chen, Ping Schroeder, Genevieve Govreen-Segal, Taya Bochenek, Aleksandra Qin, Yu-Jing Gillanders, James H. Amend, Benjamin Anderson, Joseph P. Andreoni, Igor Aryan, Amar Bellm, Eric C. Bloom, Joshua S. de Boer, Thomas Carney, Jonathan Caiazzo, Ilaria Chambers, Ken C. Charalampopoulos, Panos Chen, Ting-Wan Chen, Tracy X. Coughlin, Eric R. Coughlin, Michael Dennefeld, Michel Dimitriadis, Georgios Fremling, Christoffer Frostig, Danielle Gal-Yam, Avishay Galbany, Lluís Gangopadhyay, Anjashay Ghendrih, Melzie Graham, Matthew J. Gromadzki, Mariusz Groom, Steven L. Gutiérrez, Claudia P. Hinds, K. -Ryan Huber, Mark E. Inserra, Cosimo Kaiser, Benjamin C. Kasliwal, Mansi M. Koivisto, Niilo E. Lin, Chien-Cheng Liu, Chang Lowe, Thomas B. Magnier, Eugene Mahabal, Ashish A. Milligan, Andrew Minguez, Paloma Mo, Geoffrey Müller-Bravo, Tomás E. Nicholl, Matt Pessi, Priscila J. Pignata, Giuliano Purdum, Josiah Rehemtulla, Nabeel Rich, R. Michael Sahu, Anwesha Singh, Avinash Smartt, Stephen J. Sollerman, Jesper Srinivasaragavan, Gokul Srivastav, Shubham Stein, Robert D. Schulze, Steve Tweddle, Jack W. Wainscoat, Richard Wise, Jacob L. Yan, Lin Young, David R. |
| contents | We present the discovery of AT 2024wpp ("Whippet"), a fast and luminous 18cow-like transient. At a redshift of z=0.0868, revealed by Keck Cosmic Web Imager spectroscopy of its faint star-forming host, it is the fourth-nearest example of its class to date. Rapid identification of the source in the Zwicky Transient Facility data stream permitted ultraviolet-through-optical observations to be obtained prior to peak, allowing the first determination of the peak bolometric luminosity (2x10^45 erg/s), maximum photospheric radius (10^15 cm), and total radiated energy (10^51 erg) of an 18cow-like object. We present results from a comprehensive multiwavelength observing campaign, including a far-UV spectrum from the Cosmic Origins Spectrograph on the Hubble Space Telescope and deep imaging extending >100 days post-explosion from the Very Large Telescope, Hubble Space Telescope, Very Large Array, and Atacama Large Millimetre Array. We interpret the observations under a model in which a rapidly-accreting central engine blows a fast (~0.2c) wind into the surrounding medium and irradiates it with X-rays. The high Doppler velocities and intense ionization within this wind prevent identifiable spectroscopic features from appearing in the ejecta or in the surrounding circumstellar material. Weak H and He signatures do emerge in the spectra after 35 days in the form of double-peaked narrow lines. Each peak is individually narrow (full width ~3000 km/s) but the two components are separated by ~6600 km/s, indicating stable structures of denser material, possibly representing streams of tidal ejecta or an ablated companion star. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_03337 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | AT2024wpp: An Extremely Luminous Fast Ultraviolet Transient Powered by Accretion onto a Black Hole Perley, Daniel A. Ho, Anna Y. Q. McGrath, Zoë Camilo, Michael Sevilla, Cassie Chen, Ping Schroeder, Genevieve Govreen-Segal, Taya Bochenek, Aleksandra Qin, Yu-Jing Gillanders, James H. Amend, Benjamin Anderson, Joseph P. Andreoni, Igor Aryan, Amar Bellm, Eric C. Bloom, Joshua S. de Boer, Thomas Carney, Jonathan Caiazzo, Ilaria Chambers, Ken C. Charalampopoulos, Panos Chen, Ting-Wan Chen, Tracy X. Coughlin, Eric R. Coughlin, Michael Dennefeld, Michel Dimitriadis, Georgios Fremling, Christoffer Frostig, Danielle Gal-Yam, Avishay Galbany, Lluís Gangopadhyay, Anjashay Ghendrih, Melzie Graham, Matthew J. Gromadzki, Mariusz Groom, Steven L. Gutiérrez, Claudia P. Hinds, K. -Ryan Huber, Mark E. Inserra, Cosimo Kaiser, Benjamin C. Kasliwal, Mansi M. Koivisto, Niilo E. Lin, Chien-Cheng Liu, Chang Lowe, Thomas B. Magnier, Eugene Mahabal, Ashish A. Milligan, Andrew Minguez, Paloma Mo, Geoffrey Müller-Bravo, Tomás E. Nicholl, Matt Pessi, Priscila J. Pignata, Giuliano Purdum, Josiah Rehemtulla, Nabeel Rich, R. Michael Sahu, Anwesha Singh, Avinash Smartt, Stephen J. Sollerman, Jesper Srinivasaragavan, Gokul Srivastav, Shubham Stein, Robert D. Schulze, Steve Tweddle, Jack W. Wainscoat, Richard Wise, Jacob L. Yan, Lin Young, David R. High Energy Astrophysical Phenomena We present the discovery of AT 2024wpp ("Whippet"), a fast and luminous 18cow-like transient. At a redshift of z=0.0868, revealed by Keck Cosmic Web Imager spectroscopy of its faint star-forming host, it is the fourth-nearest example of its class to date. Rapid identification of the source in the Zwicky Transient Facility data stream permitted ultraviolet-through-optical observations to be obtained prior to peak, allowing the first determination of the peak bolometric luminosity (2x10^45 erg/s), maximum photospheric radius (10^15 cm), and total radiated energy (10^51 erg) of an 18cow-like object. We present results from a comprehensive multiwavelength observing campaign, including a far-UV spectrum from the Cosmic Origins Spectrograph on the Hubble Space Telescope and deep imaging extending >100 days post-explosion from the Very Large Telescope, Hubble Space Telescope, Very Large Array, and Atacama Large Millimetre Array. We interpret the observations under a model in which a rapidly-accreting central engine blows a fast (~0.2c) wind into the surrounding medium and irradiates it with X-rays. The high Doppler velocities and intense ionization within this wind prevent identifiable spectroscopic features from appearing in the ejecta or in the surrounding circumstellar material. Weak H and He signatures do emerge in the spectra after 35 days in the form of double-peaked narrow lines. Each peak is individually narrow (full width ~3000 km/s) but the two components are separated by ~6600 km/s, indicating stable structures of denser material, possibly representing streams of tidal ejecta or an ablated companion star. |
| title | AT2024wpp: An Extremely Luminous Fast Ultraviolet Transient Powered by Accretion onto a Black Hole |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.03337 |