Unveiling the First O-Type Bloated Star Candidate through ALMA and EVLA Observations
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915737654788096 |
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| author | Pandey, Rakesh Palau, Aina Sánchez-Monge, Alvaro Sahai, Raghvendra Kuiper, Rolf Rodríguez, Luis F. Contreras, Carmen Sánchez Sharma, Saurabh |
| author_facet | Pandey, Rakesh Palau, Aina Sánchez-Monge, Alvaro Sahai, Raghvendra Kuiper, Rolf Rodríguez, Luis F. Contreras, Carmen Sánchez Sharma, Saurabh |
| contents | We investigate the circumstellar environment of the O-type bloated star candidate IRAS 19520+2759 (I19520) using high-resolution observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and the Expanded Very Large Array (EVLA). Radio continuum emission traced by the EVLA (C, K, and Q bands) exhibits a spectral index of 0.5, consistent with a thermal jet. ALMA 1.3 mm continuum map reveals a compact source coincident with the optical counterpart of I19520, likely tracing the dense core hosting the central massive young stellar object. A prominent molecular outflow in the east-west direction, along with a possible secondary outflow oriented northeast-southwest, is identified in the $^{13}\mathrm{CO}$ emission. A hot molecular core and a Keplerian disk are detected in several $\mathrm{SO}_2$ transitions. Assuming an edge-on disk geometry, the dynamical mass of the central object is estimated to be in the range of $10$-$15~M_\odot$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_12336 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unveiling the First O-Type Bloated Star Candidate through ALMA and EVLA Observations Pandey, Rakesh Palau, Aina Sánchez-Monge, Alvaro Sahai, Raghvendra Kuiper, Rolf Rodríguez, Luis F. Contreras, Carmen Sánchez Sharma, Saurabh Solar and Stellar Astrophysics Astrophysics of Galaxies We investigate the circumstellar environment of the O-type bloated star candidate IRAS 19520+2759 (I19520) using high-resolution observations from the Atacama Large Millimeter/submillimeter Array (ALMA) and the Expanded Very Large Array (EVLA). Radio continuum emission traced by the EVLA (C, K, and Q bands) exhibits a spectral index of 0.5, consistent with a thermal jet. ALMA 1.3 mm continuum map reveals a compact source coincident with the optical counterpart of I19520, likely tracing the dense core hosting the central massive young stellar object. A prominent molecular outflow in the east-west direction, along with a possible secondary outflow oriented northeast-southwest, is identified in the $^{13}\mathrm{CO}$ emission. A hot molecular core and a Keplerian disk are detected in several $\mathrm{SO}_2$ transitions. Assuming an edge-on disk geometry, the dynamical mass of the central object is estimated to be in the range of $10$-$15~M_\odot$. |
| title | Unveiling the First O-Type Bloated Star Candidate through ALMA and EVLA Observations |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.12336 |