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On the Impact of Inclination-dependent Attenuation on Derived Star Formation Histories: Results from Disk Galaxies in the Great Observatories Origins Deep Survey Fields
Basu-Zych, Antara; Garofali, Kristen; Lehmer, Bret D. +4 more
We develop and implement an inclination-dependent attenuation prescription for spectral energy distribution (SED) fitting and study its impact on derived star formation histories. We apply our prescription within the SED fitting code Lightning to a clean sample of 82, z = 0.21-1.35 disk-dominated galaxies in the Great Observatories Origins Deep Su…
Census of R Coronae Borealis Stars. I. Infrared Light Curves from Palomar Gattini IR
Soria, Roberto; Tinyanont, Samaporn; De, Kishalay +16 more
We are undertaking the first systematic infrared (IR) census of R Coronae Borealis (RCB) stars in the Milky Way, beginning with IR light curves from the Palomar Gattini IR (PGIR) survey. The PGIR is a 30 cm J-band telescope with a 25 deg2 camera that is surveying 18,000 deg2 of the northern sky (δ > -28°) at a cadence of 2…
Venus upper atmosphere revealed by a GCM: II. Model validation with temperature and density measurements
Lefèvre, Franck; Lebonnois, Sebastien; Schubert, Gerald +5 more
An improved high resolution (96 longitude by 96 latitude points) ground-to-thermosphere version of the Institut Pierre-Simon Laplace (IPSL) Venus General Circulation Model (VGCM), including non-orographic gravity waves (GW) parameterization and fine-tuned non-LTE parameters, is presented here. We focus on the validation of the model built from a c…
XMM-Newton Observes the Intrabinary Shock of PSR J1959+2048
An, Hongjun; Romani, Roger W.; Kandel, D.
In a multi-orbit (100 ks) XMM-Newton exposure of the original black widow pulsar, PSR J1959+2048, we measure the strong orbital modulation caused by intrabinary shock (IBS) emission. The IBS light curve peak appears asymmetric, which we attribute to sweep-back effects in the companion wind. We also see evidence for an X-ray eclipse by the companio…
Discovery of an Edge-on Circumstellar Debris Disk around BD+45° 598: A Newly Identified Member of the β Pictoris Moving Group
Mamajek, Eric; Hinkley, Sasha; Matthews, Brenda +25 more
We report the discovery of a circumstellar debris disk viewed nearly edge-on and associated with the young, K1 star BD+45° 598 using high-contrast imaging at 2.2 µm obtained at the W.M. Keck Observatory. We detect the disk in scattered light with a peak significance of ∼5σ over three epochs, and our best-fit model of the disk is an almost ed…
MMX geodesy investigations: science requirements and observation strategy
Kouyama, Toru; Baresi, Nicola; Hirata, Naru +10 more
In order to investigate the origin of Phobos and Deimos, the Japanese Martian Moons eXploration (MMX) mission is scheduled for launch in 2024. MMX will make comprehensive remote-sensing measurements of both moons and return regolith samples from Phobos to Earth. Geodetic measurements of gravity, shape, and rotation parameter of a body provides con…
The shape and scatter of the galaxy main sequence for massive galaxies at cosmic noon
Papovich, Casey; Finkelstein, Steven L.; Stevans, Matthew L. +7 more
We present the main sequence for all galaxies and star-forming galaxies for a sample of 28 469 massive (M⋆ ≥ 1011 M⊙) galaxies at cosmic noon (1.5 < z < 3.0), uniformly selected from a 17.5 deg2 area (0.33 Gpc3 comoving volume at these redshifts). Our large sample allows for a novel appr…
Multiple Sources of Solar High-energy Protons
Yu, Sijie; Vainio, Rami; Gary, Dale E. +6 more
During the 24th solar cycle, the Fermi Large Area Telescope (LAT) has observed a total of 27 solar flares possessing delayed γ-ray emission, including the exceptionally well-observed flare and coronal mass ejection (CME) on 2017 September 10. Based on the Fermi/LAT data, we plot, for the first time, maps of possible sources of the delayed >100 …
Is Flare Ribbon Fine Structure Related to Tearing in the Flare Current Sheet?
Wyper, P. F.; Pontin, D. I.
Observations of solar flare ribbons show significant fine structure in the form of breaking wavelike perturbations and spirals. The origin of this structure is not well understood, but one possibility is that it is related to the tearing instability in the flare current sheet. Here we study this connection by constructing an analytical 3D magnetic…
The Timing of Alluvial Fan Formation on Mars
Wilson, Sharon A.; Kite, Edwin S.; Holo, Samuel J. +1 more
The history of rivers on Mars is an important constraint on Martian climate evolution. The timing of relatively young, alluvial fan-forming rivers is especially important, as Mars's Amazonian atmosphere is thought to have been too thin to consistently support surface liquid water. Previous regional studies suggested that alluvial fans formed prima…