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Four Sub-Saturns with Dissimilar Densities: Windows into Planetary Cores and Envelopes
Schlieder, Joshua E.; Howell, Steve B.; Fulton, Benjamin J. +12 more
We present results from a Keck/HIRES radial velocity campaign to study four sub-Saturn-sized planets, K2-27b, K2-32b, K2-39b, and K2-108b, with the goal of understanding their masses, orbits, and heavy-element enrichment. The planets have similar sizes ({R}{{P}} = 4.5-5.5 {R}\oplus ), but have dissimilar masses ({M}{{P
High-resolution observations of flare precursors in the low solar atmosphere
Xu, Yan; Cao, Wenda; Liu, Chang +9 more
Solar flares are generally believed to be powered by free magnetic energy stored in the corona1, but the build up of coronal energy alone may be insufficient to trigger the flare to occur2. The flare onset mechanism is a critical but poorly understood problem, insights into which could be gained from small-scale energy releas…
The nature of massive transition galaxies in CANDELS, GAMA and cosmological simulations
Papovich, Casey; Barro, Guillermo; Bell, Eric F. +25 more
We explore observational and theoretical constraints on how galaxies might transition between the 'star-forming main sequence' (SFMS) and varying 'degrees of quiescence' out to z = 3. Our analysis is focused on galaxies with stellar mass M* > 1010 M⊙, and is enabled by GAMA and CANDELS observations, a semi-analy…
Star Formation at z = 2.481 in the Lensed Galaxy SDSS J1110+6459: Star Formation Down to 30 pc Scales
Rigby, Jane R.; Florian, Michael; Whitaker, Katherine E. +7 more
We present measurements of the surface density of star formation, the star-forming clump luminosity function, and the clump size distribution function, for the lensed galaxy SGAS J111020.0+645950.8 at a redshift of z = 2.481. The physical size scales that we probe, radii r = 30-50 pc, are considerably smaller scales than have yet been studied at t…
A likely decade-long sustained tidal disruption event
Ramirez-Ruiz, Enrico; Gwyn, Stephen D. J.; Komossa, S. +11 more
Multiwavelength flares from tidal disruption and accretion of stars can be used to find and study otherwise dormant massive black holes in galactic nuclei 1 . Previous well-monitored candidate flares were short-lived, with most emission confined to within ∼1 year 2-5 . Here we report the discovery of a well-observed super-lon…
Pre-inflationary universe in loop quantum cosmology
Zhu, Tao; Wang, Anzhong; Cleaver, Gerald +2 more
The evolutions of the flat Friedmann-Lemaître-Robertson-Walker universe and its linear perturbations are studied systematically in the dressed metric approach of loop quantum cosmology. When it is dominated by the kinetic energy of the inflaton at the quantum bounce, the evolution of the background can be divided into three different phases prior …
Molecular Gas Dominated 50 kpc Ram Pressure Stripped Tail of the Coma Galaxy D100
Yoshida, Michitoshi; Combes, Françoise; Sun, Ming +6 more
We have discovered large amounts of molecular gas, as traced by CO emission, in the ram pressure stripped gas tail of the Coma cluster galaxy D100 (GMP 2910), out to large distances of about 50 kpc. D100 has a 60 kpc long, strikingly narrow tail, which is bright in X-rays and Hα. Our observations with the IRAM 30 m telescope reveal in total ∼ {10}…
KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early A Star HD 185603
Bieryla, Allyson; Latham, David W.; Quinn, Samuel N. +54 more
We report the discovery of KELT-20b, a hot Jupiter transiting a V∼ 7.6 early A star, HD 185603, with an orbital period of P≃ 3.47 days. Archival and follow-up photometry, Gaia parallax, radial velocities, Doppler tomography, and AO imaging were used to confirm the planetary nature of KELT-20b and characterize the system. From global modeling we in…
GASP. III. JO36: A Case of Multiple Environmental Effects at Play?
Charlot, Stéphane; Fritz, Jacopo; Vulcani, Benedetta +12 more
The so-called jellyfish galaxies are objects exhibiting disturbed morphology, mostly in the form of tails of gas stripped from the main body of the galaxy. Several works have strongly suggested ram pressure stripping to be the mechanism driving this phenomenon. Here, we focus on one of these objects, drawn from a sample of optically selected jelly…
A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A
Maraschi, L.; Covino, S.; Antonelli, L. A. +140 more
It is widely believed that the bulk of the Galactic cosmic rays is accelerated in supernova remnants (SNRs). However, no observational evidence of the presence of particles of PeV energies in SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one of the best candidates to study acceleration processes. Between 2014 De…