Physical and Chemical Characterization of GY 91's Multi-ringed Protostellar Disk with ALMA
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Jiang, Sally D. Huang, Jane Czekala, Ian Trapman, Leon Aikawa, Yuri Andrews, Sean M. Bae, Jaehan Bergin, Edwin A. Law, Charles J. Gal, Romane Le Long, Feng Ménard, François Öberg, Karin I. Qi, Chunhua Teague, Richard Wilner, David Zhang, Ke |
| author_facet | Jiang, Sally D. Huang, Jane Czekala, Ian Trapman, Leon Aikawa, Yuri Andrews, Sean M. Bae, Jaehan Bergin, Edwin A. Law, Charles J. Gal, Romane Le Long, Feng Ménard, François Öberg, Karin I. Qi, Chunhua Teague, Richard Wilner, David Zhang, Ke |
| contents | GY 91, commonly categorized as a Class I young stellar object, is notable for disk dust substructures that have been hypothesized to trace early planet formation. Using the ALMA 12-m and ACA arrays, we present new Band 7 dust continuum and molecular line observations of GY 91 at an angular resolution of (~40 au). We report detections of CS $J=6-5$, N$_2$H$^+$ $J=3-2$, C$^{18}$O $J=3-2$, H$_2$CS $J_{K_a, K_c} = 8_{1,7}-7_{1,6}$, H$_2$CO $J_{K_a, K_c} = 4_{0,4}-3_{0,3}$, and H$_2$CO $J_{K_a, K_c} = 4_{2,3}-3_{2,2}$, as well as a tentative detection of $^{13}$C$^{18}$O $J=3-2$. We observe azimuthal asymmetry in CS and H$_2$CS emission, as well as radially structured H$_2$CO $4_{0,4}-3_{0,3}$ emission outside the dust continuum. C$^{18}$O and H$_2$CO 4$_{0,4}-3_{0,3}$ show significant cloud contamination, while CS and N$_2$H$^+$ are good tracers of Keplerian rotation originating from the disk. Envelope emission does not appear to contribute significantly either to the continuum or molecular line observations. GY 91's chemical properties appear in large part to resemble those of Class II disks, although observations of additional molecular probes should be obtained for a fuller comparison. With CS, we estimated a dynamical stellar mass of 0.58 $M_\odot$, which is higher than previous estimates from stellar evolutionary models (0.25 $M_\odot$). Using both radiative transfer modeling of the dust continuum and comparison of the C$^{18}$O and N$_2$H$^+$ fluxes to literature thermochemical models, we estimate a disk mass of $\sim0.01$ $M_\odot$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_18884 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Physical and Chemical Characterization of GY 91's Multi-ringed Protostellar Disk with ALMA Jiang, Sally D. Huang, Jane Czekala, Ian Trapman, Leon Aikawa, Yuri Andrews, Sean M. Bae, Jaehan Bergin, Edwin A. Law, Charles J. Gal, Romane Le Long, Feng Ménard, François Öberg, Karin I. Qi, Chunhua Teague, Richard Wilner, David Zhang, Ke Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics GY 91, commonly categorized as a Class I young stellar object, is notable for disk dust substructures that have been hypothesized to trace early planet formation. Using the ALMA 12-m and ACA arrays, we present new Band 7 dust continuum and molecular line observations of GY 91 at an angular resolution of (~40 au). We report detections of CS $J=6-5$, N$_2$H$^+$ $J=3-2$, C$^{18}$O $J=3-2$, H$_2$CS $J_{K_a, K_c} = 8_{1,7}-7_{1,6}$, H$_2$CO $J_{K_a, K_c} = 4_{0,4}-3_{0,3}$, and H$_2$CO $J_{K_a, K_c} = 4_{2,3}-3_{2,2}$, as well as a tentative detection of $^{13}$C$^{18}$O $J=3-2$. We observe azimuthal asymmetry in CS and H$_2$CS emission, as well as radially structured H$_2$CO $4_{0,4}-3_{0,3}$ emission outside the dust continuum. C$^{18}$O and H$_2$CO 4$_{0,4}-3_{0,3}$ show significant cloud contamination, while CS and N$_2$H$^+$ are good tracers of Keplerian rotation originating from the disk. Envelope emission does not appear to contribute significantly either to the continuum or molecular line observations. GY 91's chemical properties appear in large part to resemble those of Class II disks, although observations of additional molecular probes should be obtained for a fuller comparison. With CS, we estimated a dynamical stellar mass of 0.58 $M_\odot$, which is higher than previous estimates from stellar evolutionary models (0.25 $M_\odot$). Using both radiative transfer modeling of the dust continuum and comparison of the C$^{18}$O and N$_2$H$^+$ fluxes to literature thermochemical models, we estimate a disk mass of $\sim0.01$ $M_\odot$. |
| title | Physical and Chemical Characterization of GY 91's Multi-ringed Protostellar Disk with ALMA |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2601.18884 |