Appraising the Necklace: A post-common-envelope carbon dwarf inside an apparently carbon-poor planetary nebula
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912940423118848 |
|---|---|
| author | Jones, David Corradi, Romano L. M. Pérez, Gustavo A. García Morisset, Christophe García-Rojas, Jorge Sabin, Laurence Balick, Bruce Wise, Jacob Mampaso, Antonio Munday, James Rodríguez-Gil, Pablo Rubio-Díez, María del Mar Santander-García, Miguel Sowicka, Paulina Csukai, Alexander Hillwig, Todd C. de la Fuente, Andrea Henderson Terwel, Jacco H. |
| author_facet | Jones, David Corradi, Romano L. M. Pérez, Gustavo A. García Morisset, Christophe García-Rojas, Jorge Sabin, Laurence Balick, Bruce Wise, Jacob Mampaso, Antonio Munday, James Rodríguez-Gil, Pablo Rubio-Díez, María del Mar Santander-García, Miguel Sowicka, Paulina Csukai, Alexander Hillwig, Todd C. de la Fuente, Andrea Henderson Terwel, Jacco H. |
| contents | Context: The Necklace nebula is a bipolar, post-common-envelope planetary nebula, the central star of which has been shown to have a dwarf carbon star companion. Aims: We aim to understand the origins of the Necklace and its dwarf carbon central star. Methods: We study the carbon abundance of the nebula through far ultraviolet spectroscopy obtained with the Hubble Space Telescope. Furthermore, through simultaneous modelling of multiband light and velocity curves, we attempt to constrain the parameters of the central star system. Results: Puzzlingly, we find that the region of the inner nebula observed with the Hubble Space Telescope is seemingly not carbon-rich, at odds with the dwarf carbon star nature of the companion of the central star. The initial mass of the nebular progenitor was likely very close to the limit to become carbon-rich, perhaps experiencing a very late thermal pulse. The dwarf carbon star companion is found to be significantly inflated with respect to that expected for an isolated main sequence star of the same mass. Conclusions: The properties of the central binary are consistent with the progenitor having become carbon-rich and its companion having accreted a significant amount of that carbon-enriched material. However, it is unclear how this evolutionary hypothesis can be reconciled with the inner nebula potentially being carbon poor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_19382 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Appraising the Necklace: A post-common-envelope carbon dwarf inside an apparently carbon-poor planetary nebula Jones, David Corradi, Romano L. M. Pérez, Gustavo A. García Morisset, Christophe García-Rojas, Jorge Sabin, Laurence Balick, Bruce Wise, Jacob Mampaso, Antonio Munday, James Rodríguez-Gil, Pablo Rubio-Díez, María del Mar Santander-García, Miguel Sowicka, Paulina Csukai, Alexander Hillwig, Todd C. de la Fuente, Andrea Henderson Terwel, Jacco H. Solar and Stellar Astrophysics Context: The Necklace nebula is a bipolar, post-common-envelope planetary nebula, the central star of which has been shown to have a dwarf carbon star companion. Aims: We aim to understand the origins of the Necklace and its dwarf carbon central star. Methods: We study the carbon abundance of the nebula through far ultraviolet spectroscopy obtained with the Hubble Space Telescope. Furthermore, through simultaneous modelling of multiband light and velocity curves, we attempt to constrain the parameters of the central star system. Results: Puzzlingly, we find that the region of the inner nebula observed with the Hubble Space Telescope is seemingly not carbon-rich, at odds with the dwarf carbon star nature of the companion of the central star. The initial mass of the nebular progenitor was likely very close to the limit to become carbon-rich, perhaps experiencing a very late thermal pulse. The dwarf carbon star companion is found to be significantly inflated with respect to that expected for an isolated main sequence star of the same mass. Conclusions: The properties of the central binary are consistent with the progenitor having become carbon-rich and its companion having accreted a significant amount of that carbon-enriched material. However, it is unclear how this evolutionary hypothesis can be reconciled with the inner nebula potentially being carbon poor. |
| title | Appraising the Necklace: A post-common-envelope carbon dwarf inside an apparently carbon-poor planetary nebula |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2601.19382 |