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Pluto's Atmosphere from the 2015 June 29 Ground-based Stellar Occultation at the Time of the New Horizons Flyby

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dc.contributor.author Sicardy, B. es_PE
dc.contributor.author Talbot, J. es_PE
dc.contributor.author Meza, E. es_PE
dc.contributor.author Camargo, J. I. B. es_PE
dc.contributor.author Desmars, J. es_PE
dc.contributor.author Gault, D. es_PE
dc.contributor.author Herald, D. es_PE
dc.contributor.author Kerr, S. es_PE
dc.contributor.author Pavlov, H. es_PE
dc.contributor.author Braga-Ribas, F. es_PE
dc.contributor.author Assafin, M. es_PE
dc.contributor.author Benedetti-Rossi, G. es_PE
dc.contributor.author Dias-Oliveira, A. es_PE
dc.contributor.author Gomes-Junior, A. R. es_PE
dc.contributor.author Vieira-Martins, R. es_PE
dc.contributor.author Berard, D. es_PE
dc.contributor.author Kervella, P. es_PE
dc.contributor.author Lecacheux, J. es_PE
dc.contributor.author Lellouch, E. es_PE
dc.contributor.author Beisker, W. es_PE
dc.contributor.author Dunham, D. es_PE
dc.contributor.author Jelinek, M. es_PE
dc.contributor.author Duffard, R. es_PE
dc.contributor.author Ortiz, J. L. es_PE
dc.contributor.author Castro-Tirado, A. J. es_PE
dc.contributor.author Cunniffe, R. es_PE
dc.contributor.author Querel, R. es_PE
dc.contributor.author Yock, P. C. es_PE
dc.contributor.author Cole, A. A. es_PE
dc.contributor.author Giles, A. B. es_PE
dc.contributor.author Hill, K. M. es_PE
dc.contributor.author Beaulieu, J. P. es_PE
dc.contributor.author Harnisch, M. es_PE
dc.contributor.author Jansen, R. es_PE
dc.contributor.author Pennell, A. es_PE
dc.contributor.author Todd, S. es_PE
dc.contributor.author Allen, W. H. es_PE
dc.contributor.author Graham, P. B. es_PE
dc.contributor.author Loader, B. es_PE
dc.contributor.author McKay, G. es_PE
dc.contributor.author Milner, J. es_PE
dc.contributor.author Parker, S. es_PE
dc.contributor.author Barry, M. A. es_PE
dc.contributor.author Bradshaw, J. es_PE
dc.contributor.author Broughton, J. es_PE
dc.contributor.author Davis, L. es_PE
dc.contributor.author Devillepoix, H. es_PE
dc.contributor.author Drummond, J. es_PE
dc.contributor.author Field, L. es_PE
dc.contributor.author Forbes, M. es_PE
dc.contributor.author Giles, D. es_PE
dc.contributor.author Glassey, R. es_PE
dc.contributor.author Groom, R. es_PE
dc.contributor.author Hooper, D. es_PE
dc.contributor.author Horvat, R. es_PE
dc.contributor.author Hudson, G. es_PE
dc.contributor.author Idaczyk, R. es_PE
dc.contributor.author Jenke, D. es_PE
dc.contributor.author Lade, B. es_PE
dc.contributor.author Newman, J. es_PE
dc.contributor.author Nosworthy, P. es_PE
dc.contributor.author Purcell, P. es_PE
dc.contributor.author Skilton, P. F. es_PE
dc.contributor.author Streamer, M. es_PE
dc.contributor.author Unwin, M. es_PE
dc.contributor.author Watanabe, H. es_PE
dc.contributor.author White, G. L. es_PE
dc.contributor.author Watson, D. es_PE
dc.date.accessioned 2024-05-30T23:13:38Z
dc.date.available 2024-05-30T23:13:38Z
dc.date.issued 2016
dc.description.abstract We present results from a multi-chord Pluto stellar occultation observed on 2015 June 29 from New Zealand and Australia. This occurred only two weeks before the NASA New Horizons flyby of the Pluto system and serves as a useful comparison between ground-based and space results. We find that Pluto's atmosphere is still expanding, with a significant pressure increase of 5 +/- 2% since 2013 and a factor of almost three since 1988. This trend rules out, as of today, an atmospheric collapse associated with Pluto's recession from the Sun. A central flash, a rare occurrence, was observed from several sites in New Zealand. The flash shape and amplitude are compatible with a spherical and transparent atmospheric layer of roughly 3 km in thickness whose base lies at about 4 km above Pluto's surface, and where an average thermal gradient of about 5 K km(-1) prevails. We discuss the possibility that small departures between the observed and modeled flash are caused by local topographic features (mountains) along Pluto's limb that block the stellar light. Finally, using two possible temperature profiles, and extrapolating our pressure profile from our deepest accessible level down to the surface, we obtain a possible range of 11.9-13.7 mu bar for the surface pressure.
dc.description.sponsorship Fondo Nacional de Desarrollo Científico y Tecnológico - Fondecyt
dc.identifier.doi https://doi.org/10.3847/2041-8205/819/2/L38
dc.identifier.uri https://hdl.handle.net/20.500.12390/2850
dc.language.iso eng
dc.publisher American Astronomical Society
dc.relation.ispartof ASTROPHYSICAL JOURNAL LETTERS
dc.rights info:eu-repo/semantics/openAccess
dc.subject Space and Planetary Science
dc.subject Astronomy and Astrophysics es_PE
dc.subject.ocde http://purl.org/pe-repo/ocde/ford#1.03.08
dc.title Pluto's Atmosphere from the 2015 June 29 Ground-based Stellar Occultation at the Time of the New Horizons Flyby
dc.type info:eu-repo/semantics/article
dspace.entity.type Publication
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