Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B
Companions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at H α , an indication that they are actively accreting. We report 5 yr (2013–2018) of monitoring of the position and H α excess luminosity of the embedded, accreting low-mass stel...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | The Astronomical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-3881/ac73f4 |
| _version_ | 1797730832471818240 |
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| author | William O. Balmer Katherine B. Follette Laird M. Close Jared R. Males Robert J. De Rosa Jéa I. Adams Redai Alex Watson Alycia J. Weinberger Katie M. Morzinski Julio Morales Kimberly Ward-Duong Laurent Pueyo |
| author_facet | William O. Balmer Katherine B. Follette Laird M. Close Jared R. Males Robert J. De Rosa Jéa I. Adams Redai Alex Watson Alycia J. Weinberger Katie M. Morzinski Julio Morales Kimberly Ward-Duong Laurent Pueyo |
| author_sort | William O. Balmer |
| collection | DOAJ |
| description | Companions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at H α , an indication that they are actively accreting. We report 5 yr (2013–2018) of monitoring of the position and H α 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 H α 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 H α 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 H α 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&c. |
| first_indexed | 2024-03-12T11:49:57Z |
| format | Article |
| id | doaj.art-b44d18c24508436592d2b8c405aef93a |
| institution | Directory Open Access Journal |
| issn | 1538-3881 |
| language | English |
| last_indexed | 2024-03-12T11:49:57Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astronomical Journal |
| spelling | doaj.art-b44d18c24508436592d2b8c405aef93a2023-08-31T10:36:31ZengIOP PublishingThe Astronomical Journal1538-38812022-01-0116412910.3847/1538-3881/ac73f4Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 BWilliam O. Balmer0https://orcid.org/0000-0001-6396-8439Katherine B. Follette1https://orcid.org/0000-0002-7821-0695Laird M. Close2https://orcid.org/0000-0002-2167-8246Jared R. Males3https://orcid.org/0000-0002-2346-3441Robert J. De Rosa4https://orcid.org/0000-0002-4918-0247Jéa I. Adams Redai5https://orcid.org/0000-0002-4489-3168Alex Watson6Alycia J. Weinberger7https://orcid.org/0000-0001-6654-7859Katie M. Morzinski8https://orcid.org/0000-0002-1384-0063Julio Morales9https://orcid.org/0000-0001-7525-7423Kimberly Ward-Duong10https://orcid.org/0000-0002-4479-8291Laurent Pueyo11https://orcid.org/0000-0003-3818-408XDepartment of Physics & Astronomy, Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD 21218, USA ; wbalmer1@jhu.edu; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore MD 21218, USA; Department of Physics & Astronomy , Amherst College, 25 East Drive, Amherst, MA 01002, USADepartment of Physics & Astronomy , Amherst College, 25 East Drive, Amherst, MA 01002, USASteward Observatory, University of Arizona , Tucson, 933 N Cherry Avenue, Tucson, AZ 85721, USASteward Observatory, University of Arizona , Tucson, 933 N Cherry Avenue, Tucson, AZ 85721, USAEuropean Southern Observatory , Alonso de Córdova 3107, Vitacura, Santiago, ChileCenter for Astrophysics , Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USADepartment of Physics & Astronomy , Amherst College, 25 East Drive, Amherst, MA 01002, USAEarth & Planets Laboratory, Carnegie Institution for Science , 5241 Broad Branch Road NW, Washington, DC 20015, USASteward Observatory, University of Arizona , Tucson, 933 N Cherry Avenue, Tucson, AZ 85721, USADepartment of Astronomy, University of Massachusetts , Amherst, MA 01003, USADepartment of Astronomy, Smith College , Northampton, MA 01063, USADepartment of Physics & Astronomy, Johns Hopkins University , 3400 N. Charles Street, Baltimore, MD 21218, USA ; wbalmer1@jhu.edu; Space Telescope Science Institute , 3700 San Martin Drive, Baltimore MD 21218, USACompanions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at H α , an indication that they are actively accreting. We report 5 yr (2013–2018) of monitoring of the position and H α 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 H α 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 H α 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 H α 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&c.https://doi.org/10.3847/1538-3881/ac73f4Direct imagingStellar accretionAccretionStar formationOrbit determination |
| spellingShingle | William O. Balmer Katherine B. Follette Laird M. Close Jared R. Males Robert J. De Rosa Jéa I. Adams Redai Alex Watson Alycia J. Weinberger Katie M. Morzinski Julio Morales Kimberly Ward-Duong Laurent Pueyo Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B The Astronomical Journal Direct imaging Stellar accretion Accretion Star formation Orbit determination |
| title | Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B |
| title_full | Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B |
| title_fullStr | Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B |
| title_full_unstemmed | Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B |
| title_short | Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B |
| title_sort | improved orbital constraints and hα photometric monitoring of the directly imaged protoplanet analog hd 142527 b |
| topic | Direct imaging Stellar accretion Accretion Star formation Orbit determination |
| url | https://doi.org/10.3847/1538-3881/ac73f4 |
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