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dc.contributor.authorChachan, Y
dc.contributor.authorJontof-Hutter, D
dc.contributor.authorKnutson, HA
dc.contributor.authorAdams, D
dc.contributor.authorGao, P
dc.contributor.authorBenneke, B
dc.contributor.authorBerta-Thompson, Z
dc.contributor.authorDai, F
dc.contributor.authorDeming, D
dc.contributor.authorFord, EB
dc.contributor.authorLee, EJ
dc.contributor.authorLibby-Roberts, JE
dc.contributor.authorMadhusudhan, N
dc.contributor.authorWakeford, HR
dc.contributor.authorWong, I
dc.date.accessioned2021-01-16T00:31:13Z
dc.date.available2021-01-16T00:31:13Z
dc.date.issued2020
dc.identifier.issn0004-6256
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/316267
dc.description.abstractExtremely low density planets ('super-puffs') are a small but intriguing subset of the transiting planet population. With masses in the super-Earth range ($1-10$ M$_{\oplus}$) and radii akin to those of giant planets ($>4$ R$_{\oplus}$), their large envelopes may have been accreted beyond the water snow line and many appear to be susceptible to catastrophic mass loss. Both the presence of water and the importance of mass loss can be explored using transmission spectroscopy. Here, we present new HST WFC3 spectroscopy and updated Kepler transit depth measurements for the super-puff Kepler-79d. We do not detect any molecular absorption features in the $1.1-1.7$ $\mu$m WFC3 bandpass and the combination of Kepler and WFC3 data are consistent with a flat line model, indicating the presence of aerosols in the atmosphere. We compare the shape of Kepler-79d's transmission spectrum to predictions from a microphysical haze model that incorporates an outward particle flux due to ongoing mass loss. We find that photochemical hazes offer an attractive explanation for the observed properties of super-puffs like Kepler-79d, as they simultaneously render the near-infrared spectrum featureless and reduce the inferred envelope mass loss rate by moving the measured radius (optical depth unity surface during transit) to lower pressures. We revisit the broader question of mass loss rates for super-puffs and find that the age estimates and mass loss rates for the majority of super-puffs can be reconciled if hazes move the photosphere from the typically assumed pressure of $\sim 10$ mbar to $\sim 10 \; \mu$bar.
dc.publisherAmerican Astronomical Society
dc.rightsAll rights reserved
dc.titleA featureless infrared transmission spectrum for the super-puff planet kepler-79d
dc.typeArticle
prism.issueIdentifier5
prism.publicationDate2020
prism.publicationNameAstronomical Journal
prism.volume160
dc.identifier.doi10.17863/CAM.63376
rioxxterms.versionofrecord10.3847/1538-3881/abb23a
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2020-11-01
dc.contributor.orcidChachan, Y [0000-0003-1728-8269]
dc.contributor.orcidJontof-Hutter, D [0000-0002-6227-7510]
dc.contributor.orcidAdams, D [0000-0001-9897-9680]
dc.contributor.orcidGao, P [0000-0002-8518-9601]
dc.contributor.orcidBenneke, B [0000-0001-5578-1498]
dc.contributor.orcidDai, F [0000-0002-8958-0683]
dc.contributor.orcidFord, EB [0000-0001-6545-639X]
dc.contributor.orcidLee, EJ [0000-0002-1228-9820]
dc.contributor.orcidLibby-Roberts, JE [0000-0002-2990-7613]
dc.contributor.orcidMadhusudhan, N [0000-0002-4869-000X]
dc.contributor.orcidWakeford, HR [0000-0003-4328-3867]
dc.contributor.orcidWong, I [0000-0001-9665-8429]
dc.identifier.eissn1538-3881
rioxxterms.typeJournal Article/Review
pubs.funder-project-idScience and Technology Facilities Council (ST/N000927/1)
cam.issuedOnline2020-10-15


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