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dc.contributor.authorBalmer, W.O.
dc.contributor.authorFollette, K.B.
dc.contributor.authorClose, L.M.
dc.contributor.authorMales, J.R.
dc.contributor.authorDe Rosa, R.J.
dc.contributor.authorAdams Redai, J.I.
dc.contributor.authorWatson, A.
dc.contributor.authorWeinberger, A.J.
dc.contributor.authorMorzinski, K.M.
dc.contributor.authorMorales, J.
dc.contributor.authorWard-Duong, K.
dc.contributor.authorPueyo, L.
dc.date.accessioned2022-08-25T00:51:54Z
dc.date.available2022-08-25T00:51:54Z
dc.date.issued2022
dc.identifier.citationBalmer, W. O., Follette, K. B., Close, L. M., Males, J. R., De Rosa, R. J., Adams Redai, J. I., Watson, A., Weinberger, A. J., Morzinski, K. M., Morales, J., Ward-Duong, K., & Pueyo, L. (2022). Improved Orbital Constraints and H α Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B. Astronomical Journal, 164(1).
dc.identifier.issn0004-6256
dc.identifier.doi10.3847/1538-3881/ac73f4
dc.identifier.urihttp://hdl.handle.net/10150/665923
dc.description.abstractCompanions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at Hα, an indication that they are actively accreting. We report 5 yr (2013-2018) of monitoring of the position and Hα excess luminosity of the embedded, accreting low-mass stellar companion HD 142527 B from the MagAO/VisAO instrument. We use pyklip, a Python implementation of the Karhunen-Loeve Image Processing algorithm, to detect the companion. Using pyklip forward modeling, we constrain the relative astrometry to 1-2 mas precision and achieve sufficient photometric precision (±0.2 mag, 3% error) to detect changes in the Hα contrast of the companion over time. In order to accurately determine the relative astrometry of the companion, we conduct an astrometric calibration of the MagAO/VisAO camera against 20 yr of Keck/NIRC2 images of the Trapezium cluster. We demonstrate agreement of our VisAO astrometry with other published positions for HD 142527 B, and use orbitize! to generate a posterior distribution of orbits fit to the relative astrometry of HD 142527 B. Our data suggest that the companion is close to periastron passage, on an orbit significantly misaligned with respect to both the wide circumbinary disk and the recently observed inner disk encircling HD 142527 A. We translate observed Hα contrasts for HD 142527 B into mass accretion rate estimates on the order of 4-9 × 10-10 M yr-1. Photometric variation in the Hα excess of the companion suggests that the accretion rate onto the companion is variable. This work represents a significant step toward observing accretion-driven variability onto protoplanets, such as PDS 70 b © 2022. The Author(s). Published by the American Astronomical Society.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.rightsCopyright © 2022 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleImproved Orbital Constraints and H α Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B
dc.typeArticle
dc.typetext
dc.contributor.departmentSteward Observatory, University of Arizona
dc.identifier.journalAstronomical Journal
dc.description.noteOpen access journal
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitleAstronomical Journal
refterms.dateFOA2022-08-25T00:51:54Z


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Copyright © 2022 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as Copyright © 2022 The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.