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Accreting protoplanets in the LkCa 15 transition disk.

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Title: Accreting protoplanets in the LkCa 15 transition disk.
Authors: Sallum, S., Follette, K. B., Eisner, J. A., Close, L. M., Hinz, P., Kratter, K., Males, J., Skemer, A., Macintosh, B., Tuthill, P., Bailey, V., Defrère, D., Morzinski, K., Rodigas, T., Spalding, E., Vaz, A., Weinberger, A. J.
Source: Nature. 11/19/2015, Vol. 527 Issue 7578, p342-344. 3p. 2 Diagrams, 3 Charts, 8 Graphs.
Subjects: Protoplanetary disks, Detection of extrasolar planets, Disks (Astrophysics), Astrophysics, Origin of planets, Planetary spectra, Adaptive optics, Charts, diagrams, etc.
Abstract: Exoplanet detections have revolutionized astronomy, offering new insights into solar system architecture and planet demographics. While nearly 1,900 exoplanets have now been discovered and confirmed, none are still in the process of formation. Transition disks, protoplanetary disks with inner clearings best explained by the influence of accreting planets, are natural laboratories for the study of planet formation. Some transition disks show evidence for the presence of young planets in the form of disk asymmetries or infrared sources detected within their clearings, as in the case of LkCa 15 (refs 8, 9). Attempts to observe directly signatures of accretion onto protoplanets have hitherto proven unsuccessful. Here we report adaptive optics observations of LkCa 15 that probe within the disk clearing. With accurate source positions over multiple epochs spanning 2009-2015, we infer the presence of multiple companions on Keplerian orbits. We directly detect Hα emission from the innermost companion, LkCa 15 b, evincing hot (about 10,000 kelvin) gas falling deep into the potential well of an accreting protoplanet. [ABSTRACT FROM AUTHOR]
Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: <searchLink fieldCode="AR" term="%22Sallum%2C+S%2E%22">Sallum, S.</searchLink><br /><searchLink fieldCode="AR" term="%22Follette%2C+K%2E+B%2E%22">Follette, K. B.</searchLink><br /><searchLink fieldCode="AR" term="%22Eisner%2C+J%2E+A%2E%22">Eisner, J. A.</searchLink><br /><searchLink fieldCode="AR" term="%22Close%2C+L%2E+M%2E%22">Close, L. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Hinz%2C+P%2E%22">Hinz, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Kratter%2C+K%2E%22">Kratter, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Males%2C+J%2E%22">Males, J.</searchLink><br /><searchLink fieldCode="AR" term="%22Skemer%2C+A%2E%22">Skemer, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Macintosh%2C+B%2E%22">Macintosh, B.</searchLink><br /><searchLink fieldCode="AR" term="%22Tuthill%2C+P%2E%22">Tuthill, P.</searchLink><br /><searchLink fieldCode="AR" term="%22Bailey%2C+V%2E%22">Bailey, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Defrère%2C+D%2E%22">Defrère, D.</searchLink><br /><searchLink fieldCode="AR" term="%22Morzinski%2C+K%2E%22">Morzinski, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Rodigas%2C+T%2E%22">Rodigas, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Spalding%2C+E%2E%22">Spalding, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Vaz%2C+A%2E%22">Vaz, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Weinberger%2C+A%2E+J%2E%22">Weinberger, A. J.</searchLink>
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  Data: Exoplanet detections have revolutionized astronomy, offering new insights into solar system architecture and planet demographics. While nearly 1,900 exoplanets have now been discovered and confirmed, none are still in the process of formation. Transition disks, protoplanetary disks with inner clearings best explained by the influence of accreting planets, are natural laboratories for the study of planet formation. Some transition disks show evidence for the presence of young planets in the form of disk asymmetries or infrared sources detected within their clearings, as in the case of LkCa 15 (refs 8, 9). Attempts to observe directly signatures of accretion onto protoplanets have hitherto proven unsuccessful. Here we report adaptive optics observations of LkCa 15 that probe within the disk clearing. With accurate source positions over multiple epochs spanning 2009-2015, we infer the presence of multiple companions on Keplerian orbits. We directly detect Hα emission from the innermost companion, LkCa 15 b, evincing hot (about 10,000 kelvin) gas falling deep into the potential well of an accreting protoplanet. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nature is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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