exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity
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2025
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| author | Gardner, Charles H. Isella, Andrea Li, Hui Li, Shengtai Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Eisner, Josh A. Facchini, Stefano Fasano, Daniele Flock, Mario Follette, Katherine B. Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Ireland, Michael J. Izquierdo, Andrés F. Johns-Krull, Christopher M. Kanagawa, Kazuhiro Kraus, Adam L. Lesur, Geoffroy Liu, Shangfei Longarini, Cristiano Loomis, Ryan A. Menard, Francois Orihara, Ryuta Pinte, Christophe Price, Daniel Ricci, Luca Rosotti, Giovanni Sallum, Steph Stadler, Jochen Teague, Richard Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yen, Hsi-Wei Yoshida, Tomohiro C. Zawadzki, Brianna Zhu, Zhaohuan |
| author_facet | Gardner, Charles H. Isella, Andrea Li, Hui Li, Shengtai Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Eisner, Josh A. Facchini, Stefano Fasano, Daniele Flock, Mario Follette, Katherine B. Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Ireland, Michael J. Izquierdo, Andrés F. Johns-Krull, Christopher M. Kanagawa, Kazuhiro Kraus, Adam L. Lesur, Geoffroy Liu, Shangfei Longarini, Cristiano Loomis, Ryan A. Menard, Francois Orihara, Ryuta Pinte, Christophe Price, Daniel Ricci, Luca Rosotti, Giovanni Sallum, Steph Stadler, Jochen Teague, Richard Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yen, Hsi-Wei Yoshida, Tomohiro C. Zawadzki, Brianna Zhu, Zhaohuan |
| contents | In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading theory being the interaction between the disk and newly formed planets. In this Letter, we present high angular resolution ALMA observations of LkCa~15's disk that reveal a striking difference in dust and CO emission morphology. The dust continuum emission shows a ring-like structure characterized by a dust-depleted inner region of $\sim$40 au in radius. Conversely, the CO emission is radially smoother and shows no sign of gas depletion within the dust cavity. We compare the observations with models for the disk-planet interaction, including radiative transfer calculation in the dust and CO emission. This source is particularly interesting as the presence of massive planets within the dust cavity has been suggested based on previous NIR observations. We find that the level of CO emission observed within the dust cavity is inconsistent with the presence of planets more massive than Jupiter orbiting between 10-40 au. Instead, we argue that the LkCa~15 innermost dust cavity might be created either by a chain of low-mass planets, or by other processes that do not require the presence of planets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19868 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity Gardner, Charles H. Isella, Andrea Li, Hui Li, Shengtai Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Eisner, Josh A. Facchini, Stefano Fasano, Daniele Flock, Mario Follette, Katherine B. Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Ireland, Michael J. Izquierdo, Andrés F. Johns-Krull, Christopher M. Kanagawa, Kazuhiro Kraus, Adam L. Lesur, Geoffroy Liu, Shangfei Longarini, Cristiano Loomis, Ryan A. Menard, Francois Orihara, Ryuta Pinte, Christophe Price, Daniel Ricci, Luca Rosotti, Giovanni Sallum, Steph Stadler, Jochen Teague, Richard Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yen, Hsi-Wei Yoshida, Tomohiro C. Zawadzki, Brianna Zhu, Zhaohuan Earth and Planetary Astrophysics Solar and Stellar Astrophysics In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading theory being the interaction between the disk and newly formed planets. In this Letter, we present high angular resolution ALMA observations of LkCa~15's disk that reveal a striking difference in dust and CO emission morphology. The dust continuum emission shows a ring-like structure characterized by a dust-depleted inner region of $\sim$40 au in radius. Conversely, the CO emission is radially smoother and shows no sign of gas depletion within the dust cavity. We compare the observations with models for the disk-planet interaction, including radiative transfer calculation in the dust and CO emission. This source is particularly interesting as the presence of massive planets within the dust cavity has been suggested based on previous NIR observations. We find that the level of CO emission observed within the dust cavity is inconsistent with the presence of planets more massive than Jupiter orbiting between 10-40 au. Instead, we argue that the LkCa~15 innermost dust cavity might be created either by a chain of low-mass planets, or by other processes that do not require the presence of planets. |
| title | exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2504.19868 |