Search Publications
Phase-Space Correlations among Systems of Satellite Galaxies
Pawlowski, Marcel S.
Driven by the increasingly complete observational knowledge of systems of satellite galaxies, mutual spatial alignments and relations in velocities among satellites belonging to a common host have become a productive field of research. Numerous studies have investigated different types of such phase-space correlations and were met with varying deg…
A transient radio source consistent with a merger-triggered core collapse supernova
Kulkarni, S. R.; Hallinan, G.; Horesh, A. +10 more
A core collapse supernova occurs when exothermic fusion ceases in the core of a massive star, which is typically caused by exhaustion of nuclear fuel. Theory predicts that fusion could be interrupted earlier by merging of the star with a compact binary companion. We report a luminous radio transient, VT J121001+495647, found in the Very Large Arra…
Revealing the relation between black hole growth and host-galaxy compactness among star-forming galaxies
Brandt, W. N.; Xue, Y. Q.; Luo, B. +8 more
Recent studies show that a universal relation between black hole (BH) growth and stellar mass (M⋆) or star formation rate (SFR) is an oversimplification of BH-galaxy coevolution, and that morphological and structural properties of host galaxies must also be considered. Particularly, a possible connection between BH growth and host-galax…
Testing the role of environmental effects on the initial mass function of low-mass stars
Jose, Jessy; Samal, Manash R.; Moraux, Estelle +3 more
In the star-formation process, the vital impact of environmental factors such as feedback from massive stars and stellar density on the form of the initial mass function (IMF) at the low-mass end is yet to be understood. Hence a systematic highly sensitive observational analysis of a sample of regions under diverse environmental conditions is esse…
The Extraordinary Outburst in the Massive Protostellar System NGC 6334 I-MM1: Strong Increase in Mid-Infrared Continuum Emission
Stecklum, B.; Dowell, C. D.; Hunter, T. R. +7 more
In recent years, dramatic outbursts have been identified toward massive protostars via infrared and millimeter dust continuum and molecular maser emission. The longest lived outburst (>6 yr) persists in NGC 6334 I-MM1, a deeply embedded object with no near-IR counterpart. Using FORCAST and HAWC+ on SOFIA, we have obtained the first mid-IR image…
The Star Formation History of Eridanus II: On the Role of Supernova Feedback in the Quenching of Ultrafaint Dwarf Galaxies
Salvadori, S.; Anderson, J.; Cignoni, M. +17 more
Eridanus II (Eri II) is an ultrafaint dwarf (UFD) galaxy (MV = -7.1) located at a distance close to the Milky Way virial radius. Early shallow color-magnitude diagrams (CMDs) indicated that it possibly hosted an intermediate-age or even young stellar population, which is unusual for a galaxy of this mass. In this paper, we present new H…
Improving sampling and calibration of gamma-ray bursts as distance indicators
Montiel, Ariadna; Cabrera, J. I.; Hidalgo, Juan Carlos
We present a sample of 74 gamma-ray bursts (GRBs) from the Fermi-GBM catalogue for which we compute the distance moduli and use them to constrain effective dark energy models. To overcome the circularity problem affecting GRBs as distance indicators, we calibrate the Amati relation of our sample with a cosmology-independent technique. Specifically…
Slow Cooling and Fast Reinflation for Hot Jupiters
Fortney, Jonathan J.; Huber, Daniel; Berger, Travis A. +2 more
The unexpectedly large radii of hot Jupiters are a longstanding mystery whose solution will provide important insights into their interior physics. Many potential solutions have been suggested, which make diverse predictions about the details of inflation. In particular, although any valid model must allow for maintaining large planetary radii, on…
A Sub-2% Distance to M31 from Photometrically Homogeneous Near-infrared Cepheid Period-Luminosity Relations Measured with the Hubble Space Telescope
Casertano, Stefano; Li, Siyang; Riess, Adam G. +3 more
We present period-luminosity relations (PLRs) for 55 Cepheids in M31 with periods ranging from 4 to 78 days observed with the Hubble Space Telescope using the same three-band photometric system recently used to calibrate their luminosities. Images were taken with the Wide Field Camera 3 in two optical filters (F555W and F814W) and one near-infrare…
Convective blueshift strengths of 810 F to M solar-type stars
Reiners, A.; Zechmeister, M.; Jeffers, S. V. +1 more
Context. The detection of Earth-mass exoplanets in the habitable zone around solar-mass stars using the radial velocity technique requires extremely high precision, on the order of 10 cm s−1. This puts the required noise floor below the intrinsic variability of even relatively inactive stars, such as the Sun. One such variable is convec…