Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagitarii
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| Formato: | Preprint |
| Publicado: |
2025
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| author | Tovmassian, Gagik Belloni, Diogo Pala, Anna F. Kupfer, Thomas Yu, Weitian Gänsicke, Boris T. Waagen, Elizabeth O. González-Carballo, Juan-Luis Szkody, Paula de Martino, Domitilla Schreiber, Matthias R. Long, Knox S. Bedard, Alan Bednarz, Slawomir Berenguer, Jordi Bernacki, Krzysztof Bolzoni, Simone Botana-Albá, Carlos Cantrell, Christopher Cooney, Walt Cynamon, Charles Fernández, Pablo De la Fuente Dufoer, Sjoerd Mañanes, Esteban Fernández García-Cuesta, Faustino Farfán, Rafael Gonzalez Fleurant, Pierre A. Gómez, Enrique A. Green, Matthew J. Hambsch, Franz-Josef Jordanov, Penko Kardasis, Emmanuel Lane, David Lee, Darrell Lima, Isabel J. Martínez, Fernando Limón Locatelli, Gianpiero Martin-Velasco, Jose-Luis Mendicini, Daniel J. Michaud, Michel Ortíz, Moisés Montero Reyes Aimar, Mario Morales Myers, Gordon Nogues, Ramon Naves Pappa, Giuseppe Pearce, Andrew Pierce, James Popowicz, Adam Rodrigues, Claudia V. Rodríguez, Nieves C. Amat, David Quiles Reina-Lorenz, Esteban Salto-González, José-Luis Shears, Jeremy Sikora, John Steenkamp, André Stubbings, Rod Young, Brad Walton, Ivan L. |
| author_facet | Tovmassian, Gagik Belloni, Diogo Pala, Anna F. Kupfer, Thomas Yu, Weitian Gänsicke, Boris T. Waagen, Elizabeth O. González-Carballo, Juan-Luis Szkody, Paula de Martino, Domitilla Schreiber, Matthias R. Long, Knox S. Bedard, Alan Bednarz, Slawomir Berenguer, Jordi Bernacki, Krzysztof Bolzoni, Simone Botana-Albá, Carlos Cantrell, Christopher Cooney, Walt Cynamon, Charles Fernández, Pablo De la Fuente Dufoer, Sjoerd Mañanes, Esteban Fernández García-Cuesta, Faustino Farfán, Rafael Gonzalez Fleurant, Pierre A. Gómez, Enrique A. Green, Matthew J. Hambsch, Franz-Josef Jordanov, Penko Kardasis, Emmanuel Lane, David Lee, Darrell Lima, Isabel J. Martínez, Fernando Limón Locatelli, Gianpiero Martin-Velasco, Jose-Luis Mendicini, Daniel J. Michaud, Michel Ortíz, Moisés Montero Reyes Aimar, Mario Morales Myers, Gordon Nogues, Ramon Naves Pappa, Giuseppe Pearce, Andrew Pierce, James Popowicz, Adam Rodrigues, Claudia V. Rodríguez, Nieves C. Amat, David Quiles Reina-Lorenz, Esteban Salto-González, José-Luis Shears, Jeremy Sikora, John Steenkamp, André Stubbings, Rod Young, Brad Walton, Ivan L. |
| contents | The overwhelming majority of CVs have orbital periods shorter than 10 hr. However, a few have much longer periods, and their formation and existence pose challenges for the CV evolution models. These extremely long-period CVs must host nuclearly evolved donor stars, as otherwise, the companion of the white dwarf would be too small to fill its Roche lobe. This makes them natural laboratories for testing binary evolution models and accretion processes with subgiant donors. To shed light on the formation and evolution of accreting compact objects with subgiant companions, we investigated two extremely long-period CVs in detail, namely V479 And and V1082 Sgr. We searched for reasonable formation pathways to explain their refined stellar and binary parameters. We used a broad set of new observations, including ultraviolet and infrared spectroscopy, results of circular polarimetry, and improved Gaia distance estimates to determine fundamental parameters to be confronted with numerical simulations. Furthermore, we utilized the MESA code to conduct numerical simulations, employing state-of-the-art prescriptions, such as the CARB model for strong magnetic braking. Both systems have unusual chemical compositions and very low masses for their assigned spectral classes. This most likely indicates that they underwent thermal timescale mass transfer. We found models for both that can reasonably reproduce their properties. We conclude that the donor stars in both V479 And and V1082 Sgr are filling their Roche lobes. Our findings suggest that orbital angular momentum loss is stronger due to magnetic braking in CVs with subgiant donors compared to those with unevolved donors. In addition, our findings suggest that extremely long-period CVs could significantly contribute to the population of double white dwarf binaries in close orbits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_21358 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagitarii Tovmassian, Gagik Belloni, Diogo Pala, Anna F. Kupfer, Thomas Yu, Weitian Gänsicke, Boris T. Waagen, Elizabeth O. González-Carballo, Juan-Luis Szkody, Paula de Martino, Domitilla Schreiber, Matthias R. Long, Knox S. Bedard, Alan Bednarz, Slawomir Berenguer, Jordi Bernacki, Krzysztof Bolzoni, Simone Botana-Albá, Carlos Cantrell, Christopher Cooney, Walt Cynamon, Charles Fernández, Pablo De la Fuente Dufoer, Sjoerd Mañanes, Esteban Fernández García-Cuesta, Faustino Farfán, Rafael Gonzalez Fleurant, Pierre A. Gómez, Enrique A. Green, Matthew J. Hambsch, Franz-Josef Jordanov, Penko Kardasis, Emmanuel Lane, David Lee, Darrell Lima, Isabel J. Martínez, Fernando Limón Locatelli, Gianpiero Martin-Velasco, Jose-Luis Mendicini, Daniel J. Michaud, Michel Ortíz, Moisés Montero Reyes Aimar, Mario Morales Myers, Gordon Nogues, Ramon Naves Pappa, Giuseppe Pearce, Andrew Pierce, James Popowicz, Adam Rodrigues, Claudia V. Rodríguez, Nieves C. Amat, David Quiles Reina-Lorenz, Esteban Salto-González, José-Luis Shears, Jeremy Sikora, John Steenkamp, André Stubbings, Rod Young, Brad Walton, Ivan L. Solar and Stellar Astrophysics The overwhelming majority of CVs have orbital periods shorter than 10 hr. However, a few have much longer periods, and their formation and existence pose challenges for the CV evolution models. These extremely long-period CVs must host nuclearly evolved donor stars, as otherwise, the companion of the white dwarf would be too small to fill its Roche lobe. This makes them natural laboratories for testing binary evolution models and accretion processes with subgiant donors. To shed light on the formation and evolution of accreting compact objects with subgiant companions, we investigated two extremely long-period CVs in detail, namely V479 And and V1082 Sgr. We searched for reasonable formation pathways to explain their refined stellar and binary parameters. We used a broad set of new observations, including ultraviolet and infrared spectroscopy, results of circular polarimetry, and improved Gaia distance estimates to determine fundamental parameters to be confronted with numerical simulations. Furthermore, we utilized the MESA code to conduct numerical simulations, employing state-of-the-art prescriptions, such as the CARB model for strong magnetic braking. Both systems have unusual chemical compositions and very low masses for their assigned spectral classes. This most likely indicates that they underwent thermal timescale mass transfer. We found models for both that can reasonably reproduce their properties. We conclude that the donor stars in both V479 And and V1082 Sgr are filling their Roche lobes. Our findings suggest that orbital angular momentum loss is stronger due to magnetic braking in CVs with subgiant donors compared to those with unevolved donors. In addition, our findings suggest that extremely long-period CVs could significantly contribute to the population of double white dwarf binaries in close orbits. |
| title | Revisiting the extremely long-period cataclysmic variables V479 Andromedae and V1082 Sagitarii |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2508.21358 |