dc.contributor.author | Monnier, J | |
dc.contributor.author | Harries, TJ | |
dc.contributor.author | Bae, J | |
dc.contributor.author | Setterholm, B | |
dc.contributor.author | Laws, A | |
dc.contributor.author | Aarnio, A | |
dc.contributor.author | Adams, F | |
dc.contributor.author | Andrews, S | |
dc.contributor.author | Calvet, N | |
dc.contributor.author | Espaillet, C | |
dc.contributor.author | Hartmann, L | |
dc.contributor.author | Kraus, S | |
dc.contributor.author | McClure, M | |
dc.contributor.author | Miller, C | |
dc.contributor.author | Oppenheimer, R | |
dc.contributor.author | Wilner, D | |
dc.contributor.author | Zhu, Z | |
dc.date.accessioned | 2019-01-04T15:19:58Z | |
dc.date.issued | 2019-02-19 | |
dc.description.abstract | We present the first images of the transition disk around the close binary system HD 34700A in
polarized scattered light using the Gemini Planet Imager instrument on Gemini South. The J and H
band images reveal multiple spiral-arm structures outside a large (R = 0.4900 = 175 au) cavity along
with a bluish spiral structure inside the cavity. The cavity wall shows a strong discontinuity and
we clearly see significant non-azimuthal polarization Uφ consistent with multiple scattering within a
disk at an inferred inclination ∼42◦
. Radiative transfer modeling along with a new Gaia distance
suggest HD 37400A is a young (∼5 Myr) system consisting of two intermediate-mass (∼2 M ) stars
surrounded by a transitional disk and not a solar-mass binary with a debris disk as previously classified.
Conventional assumptions of the dust-to-gas ratio would rule out a gravitational instability origin to the
spirals while hydrodynamical models using the known external companion or a hypothetical massive
protoplanet in the cavity both have trouble reproducing the relatively large spiral arm pitch angles
(∼ 30◦
) without fine tuning of gas temperature. We explore the possibility that material surrounding
a massive protoplanet could explain the rim discontinuity after also considering effects of shadowing
by an inner disk. Analysis of archival Hubble Space Telescope data suggests the disk is rotating
counterclockwise as expected from the spiral arm structure and revealed a new low-mass companion at
6.4500separation. We include an appendix which sets out clear definitions of Q, U, Qφ, Uφ, correcting
some confusion and errors in the literature. | en_GB |
dc.description.sponsorship | Science and Technology Facilities Council | en_GB |
dc.description.sponsorship | European Research Council | en_GB |
dc.description.sponsorship | NASA | en_GB |
dc.description.sponsorship | National Science Foundation (NSF) | en_GB |
dc.description.sponsorship | University of Colorado Boulder Hale Fellowship program | en_GB |
dc.identifier.citation | Vol. 872 (2). Published online 19 February 2019. | en_GB |
dc.identifier.doi | 10.3847/1538-4357/aafe87 | |
dc.identifier.grantnumber | ST/M00127X/1 | en_GB |
dc.identifier.grantnumber | ST/J001627/1 | en_GB |
dc.identifier.grantnumber | ST/J004030/1 | en_GB |
dc.identifier.grantnumber | 639889 | en_GB |
dc.identifier.grantnumber | NNX17AE31G | en_GB |
dc.identifier.grantnumber | 12100972 | en_GB |
dc.identifier.grantnumber | 1311698 | en_GB |
dc.identifier.grantnumber | 1445935 | en_GB |
dc.identifier.grantnumber | 1830728 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/35347 | |
dc.language.iso | en | en_GB |
dc.publisher | American Astronomical Society / IOP Publishing | en_GB |
dc.rights | © 2019. The American Astronomical Society. All rights reserved. | |
dc.subject | techniques: polarimetric | en_GB |
dc.subject | protoplanetary disks | en_GB |
dc.subject | stars: pre-main sequence | en_GB |
dc.subject | infrared: planetary systems | en_GB |
dc.subject | radiative transfer | en_GB |
dc.title | Multiple spiral arms in the disk around intermediate-mass binary HD 34700A | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2019-01-04T15:19:58Z | |
dc.identifier.issn | 1538-4357 | |
dc.description | This is the final version. Available from American Astronomical Society / IOP Publishing via the DOI in this record. | en_GB |
dc.identifier.journal | Astrophysical Journal | en_GB |
dc.rights.uri | http://www.rioxx.net/licenses/all-rights-reserved | en_GB |
dcterms.dateAccepted | 2018-12-15 | |
exeter.funder | ::Science and Technology Facilities Council | en_GB |
rioxxterms.version | AM | en_GB |
rioxxterms.licenseref.startdate | 2018-12-15 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2019-01-04T12:15:55Z | |
refterms.versionFCD | AM | |
refterms.dateFOA | 2019-02-21T13:49:36Z | |
refterms.panel | B | en_GB |