Searching for Protoplanets around MWC 758 and MWC 480 in Br-$γ$ using Kernel Phase and SCExAO/CHARIS
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866913427691143168 |
|---|---|
| author | Chaushev, Alexander Sallum, Steph Lozi, Julien Chilcote, Jeffrey Groff, Tyler Guyon, Olivier Kasdin, N. Jeremy Norris, Barnaby Skemer, Andy |
| author_facet | Chaushev, Alexander Sallum, Steph Lozi, Julien Chilcote, Jeffrey Groff, Tyler Guyon, Olivier Kasdin, N. Jeremy Norris, Barnaby Skemer, Andy |
| contents | Discovering new actively-accreting protoplanets is crucial to answering open questions about planet formation. However, identifying such planets at orbital distances where they are expected to be abundant is extremely challenging, both due to the technical requirements and large distances to star-forming regions. Here we use the kernel phase interferometry (KPI) technique to search for companions around the $\sim$6 and $\sim$8 Myr old Herbig Ae stars MWC 758 and MWC 480. KPI is a data analysis technique which is sensitive to moderate asymmetries, arising from eg. a circumstellar disk or companions with contrasts of up to 6-8 mags, at separations down to and even below the classical Rayleigh diffraction limit ($\sim 1.2λ/ D$). Using the high spectral resolution K-band mode of the SCExAO/CHARIS integral field spectrograph, we search for both excess Br-$γ$ line emission and continuum emission from companions around MWC 480 and MWC 758. We are able to set limits on the presence of rapidly accreting protoplanets and brown dwarfs between 4 and 16 au, well interior to those of previous studies. In Br-$γ$, we set limits on excess line emission equivalent to accretion rates ranging from $10^{-5} M_{j}^{2}.yr^{-1}$ to $10^{-6}M_{j}^{2}.yr^{-1}$. Our achievable contrasts demonstrate that KPI using SCExAO/CHARIS is a promising technique to search for giant accreting protoplanets at smaller separations compared to conventional imaging. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_08832 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Searching for Protoplanets around MWC 758 and MWC 480 in Br-$γ$ using Kernel Phase and SCExAO/CHARIS Chaushev, Alexander Sallum, Steph Lozi, Julien Chilcote, Jeffrey Groff, Tyler Guyon, Olivier Kasdin, N. Jeremy Norris, Barnaby Skemer, Andy Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Discovering new actively-accreting protoplanets is crucial to answering open questions about planet formation. However, identifying such planets at orbital distances where they are expected to be abundant is extremely challenging, both due to the technical requirements and large distances to star-forming regions. Here we use the kernel phase interferometry (KPI) technique to search for companions around the $\sim$6 and $\sim$8 Myr old Herbig Ae stars MWC 758 and MWC 480. KPI is a data analysis technique which is sensitive to moderate asymmetries, arising from eg. a circumstellar disk or companions with contrasts of up to 6-8 mags, at separations down to and even below the classical Rayleigh diffraction limit ($\sim 1.2λ/ D$). Using the high spectral resolution K-band mode of the SCExAO/CHARIS integral field spectrograph, we search for both excess Br-$γ$ line emission and continuum emission from companions around MWC 480 and MWC 758. We are able to set limits on the presence of rapidly accreting protoplanets and brown dwarfs between 4 and 16 au, well interior to those of previous studies. In Br-$γ$, we set limits on excess line emission equivalent to accretion rates ranging from $10^{-5} M_{j}^{2}.yr^{-1}$ to $10^{-6}M_{j}^{2}.yr^{-1}$. Our achievable contrasts demonstrate that KPI using SCExAO/CHARIS is a promising technique to search for giant accreting protoplanets at smaller separations compared to conventional imaging. |
| title | Searching for Protoplanets around MWC 758 and MWC 480 in Br-$γ$ using Kernel Phase and SCExAO/CHARIS |
| topic | Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2407.08832 |