Exoplanet atmospheres

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High-contrast observations of brown dwarf companion HR 2562 B with the vector Apodizing Phase Plate coronagraph

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 506:3 (2021) 3224-3238

Authors:

Ben J Sutlieff, Alexander J Bohn, Jayne L Birkby, Matthew A Kenworthy, Katie M Morzinski, David S Doelman, Jared R Males, Frans Snik, Laird M Close, Philip M Hinz, David Charbonneau
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Geophysical constraints on the properties of a subglacial lake in northwest Greenland

The Cryosphere Copernicus GmbH 15:7 (2021) 3279-3291

Authors:

Ross Maguire, Nicholas Schmerr, Erin Pettit, Kiya Riverman, Christyna Gardner, Daniella N DellaGiustina, Brad Avenson, Natalie Wagner, Angela G Marusiak, Namrah Habib, Juliette I Broadbeck, Veronica J Bray, Samuel H Bailey

Abstract:

Abstract. In this study, we report the results of an active-source seismology and ground-penetrating radar survey performed in northwestern Greenland at a site where the presence of a subglacial lake beneath the accumulation area has previously been proposed. Both seismic and radar results show a flat reflector approximately 830–845 m below the surface, with a seismic reflection coefficient of −0.43 ± 0.17, which is consistent with the acoustic impedance contrast between a layer of water and glacial ice. Additionally, in the seismic data we observe an intermittent lake bottom reflection arriving between 14–20 ms after the lake top reflection, corresponding to a lake depth of approximately 10–15 m. A strong coda following the lake top and lake bottom reflections is consistent with a package of lake bottom sediments although its thickness and material properties are uncertain. Finally, we use these results to conduct a first-order assessment of the lake origins using a one-dimensional thermal model and hydropotential modeling based on published surface and bed topography. Using these analyses, we narrow the lake origin hypotheses to either anomalously high geothermal flux or hypersalinity due to local ancient evaporite. Because the origins are still unclear, this site provides an intriguing opportunity for the first in situ sampling of a subglacial lake in Greenland, which could better constrain mechanisms of subglacial lake formation, evolution, and relative importance to glacial hydrology.
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No evidence of phosphine in the atmosphere of Venus from independent analyses

Nature Astronomy Springer Nature 5:7 (2021) 631-635

Authors:

Geronimo Villanueva, Martin Cordiner, Patrick Irwin, Imke De Pater, B Butler, M Gurwell, SN Milam, Conor Nixon, Statia Luszcz-Cook, Colin Wilson, V Kofman, G Liuzzi, S Faggi, T Fauchez, M Lippi, R Cosentino, A Thelen, A Moullet, P Hartogh, E Molter, S Charnley, G Arney, A Mandell, N Biver, A Vandaele, KR de Kleer, R Kopparapu
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Decomposing the iron cross-correlation signal of the ultra-hot Jupiter WASP-76b in transmission using 3D Monte Carlo radiative transfer

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 506:1 (2021) 1258-1283

Authors:

Joost P Wardenier, Vivien Parmentier, Elspeth KH Lee, Michael R Line, Ehsan Gharib-Nezhad
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Spitzer phase curve observations and circulation models of the inflated ultra-hot Jupiter WASP-76b

(2021)

Authors:

Erin M May, Thaddeus D Komacek, Kevin B Stevenson, Eliza M-R Kempton, Jacob L Bean, Matej Malik, Jegug Ih, Megan Mansfield, Arjun B Savel, Drake Deming, Jean-Michel Desert, Y Katherina Feng, Jonathan J Fortney, Tiffany Kataria, Nikole Lewis, Caroline Morley, Emily Rauscher, Adam Showman
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