EXPRES. III. Revealing the stellar activity radial velocity signature of ϵ Eridani with photometry and interferometry
dc.contributor.author | Roettenbacher, RM | |
dc.contributor.author | Cabot, SHC | |
dc.contributor.author | Fischer, DA | |
dc.contributor.author | Monnier, JD | |
dc.contributor.author | Henry, GW | |
dc.contributor.author | Harmon, RO | |
dc.contributor.author | Korhonen, H | |
dc.contributor.author | Brewer, JM | |
dc.contributor.author | Llama, J | |
dc.contributor.author | Petersburg, RR | |
dc.contributor.author | Zhao, LL | |
dc.contributor.author | Kraus, S | |
dc.contributor.author | Le Bouquin, J-B | |
dc.contributor.author | Anugu, N | |
dc.contributor.author | Davies, CL | |
dc.contributor.author | Gardner, T | |
dc.contributor.author | Lanthermann, C | |
dc.contributor.author | Schaefer, G | |
dc.contributor.author | Setterholm, B | |
dc.contributor.author | Clark, CA | |
dc.contributor.author | Jorstad, SG | |
dc.contributor.author | Kuehn, K | |
dc.contributor.author | Levine, S | |
dc.date.accessioned | 2022-06-20T10:04:19Z | |
dc.date.issued | 2021-12-16 | |
dc.date.updated | 2022-06-17T20:06:46Z | |
dc.description.abstract | The distortions of absorption line profiles caused by photospheric brightness variations on the surfaces of cool, main-sequence stars can mimic or overwhelm radial velocity (RV) shifts due to the presence of exoplanets. The latest generation of precision RV spectrographs aims to detect velocity amplitudes ≲ 10 cm s-1, but requires mitigation of stellar signals. Statistical techniques are being developed to differentiate between Keplerian and activity-related velocity perturbations. Two important challenges, however, are the interpretability of the stellar activity component as RV models become more sophisticated, and ensuring the lowest-amplitude Keplerian signatures are not inadvertently accounted for in flexible models of stellar activity. For the K2V exoplanet host Eridani, we separately used ground-based photometry to constrain Gaussian processes for modeling RVs and TESS photometry with a light-curve inversion algorithm to reconstruct the stellar surface. From the reconstructions of TESS photometry, we produced an activity model that reduced the rms scatter in RVs obtained with EXPRES from 4.72 to 1.98 m s-1. We present a pilot study using the CHARA Array and MIRC-X beam combiner to directly image the starspots seen in the TESS photometry. With the limited phase coverage, our spot detections are marginal with current data but a future dedicated observing campaign should allow for imaging, as well as allow the stellar inclination and orientation with respect to the debris disk to be definitively determined. This work shows that stellar surface maps obtained with high-cadence, time-series photometric and interferometric data can provide the constraints needed to accurately reduce RV scatter. | en_GB |
dc.description.sponsorship | European Commission | en_GB |
dc.description.sponsorship | NSF | en_GB |
dc.description.sponsorship | NSF | en_GB |
dc.description.sponsorship | NASA | en_GB |
dc.description.sponsorship | NASA XRP | en_GB |
dc.description.sponsorship | European Research Council | en_GB |
dc.description.sponsorship | NASA TESS GI | en_GB |
dc.description.sponsorship | Heising-Simons Foundation | en_GB |
dc.description.sponsorship | Anonymous donor in the Yale alumni community | en_GB |
dc.description.sponsorship | Yale Center for Astronomy and Astrophysics Prize Postdoctoral Fellowship | en_GB |
dc.description.sponsorship | Heising-Simons 51 Pegasi b Postdoctoral Fellowship | en_GB |
dc.format.extent | 19- | |
dc.identifier.citation | Vol. 163, No. 1, article 19 | en_GB |
dc.identifier.doi | https://doi.org/10.3847/1538-3881/ac3235 | |
dc.identifier.grantnumber | 29239380 | en_GB |
dc.identifier.grantnumber | 2009528 | en_GB |
dc.identifier.grantnumber | 1616086 | en_GB |
dc.identifier.grantnumber | 17-XRP17 2-0064 | en_GB |
dc.identifier.grantnumber | 80NSSC21K0571 | en_GB |
dc.identifier.grantnumber | 639889 | en_GB |
dc.identifier.grantnumber | 80NSSC21K0243 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/129987 | |
dc.identifier | ORCID: 0000-0001-6017-8773 (Kraus, Stefan) | |
dc.identifier | ScopusID: 24481487500 (Kraus, Stefan) | |
dc.language.iso | en_US | en_GB |
dc.publisher | IOP Publishing / American Astronomical Society | en_GB |
dc.rights | © 2021. 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. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI | en_GB |
dc.subject | Planet hosting stars (1242) | en_GB |
dc.subject | Radial velocity (1332) | en_GB |
dc.subject | Starspots (1572) | en_GB |
dc.title | EXPRES. III. Revealing the stellar activity radial velocity signature of ϵ Eridani with photometry and interferometry | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2022-06-20T10:04:19Z | |
dc.identifier.issn | 0004-6256 | |
exeter.article-number | ARTN 19 | |
dc.description | This is the final version. Available from IOP Publishing via the DOI in this record. | en_GB |
dc.identifier.eissn | 1538-3881 | |
dc.identifier.journal | The Astronomical Journal | en_GB |
dc.relation.ispartof | The Astronomical Journal, 163(1) | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2021-10-20 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2021-12-16 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2022-06-20T09:56:16Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2022-06-20T10:04:33Z | |
refterms.panel | B | en_GB |
refterms.dateFirstOnline | 2021-12-16 |
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