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Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
de Palma, Francesco; Fusco, Piergiorgio; Gargano, Fabio +129 more
Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsations have been detected from all rotation-powered MSPs. In an attempt to discover radio-quiet gamma-ray MSPs, we used the aggregated power from the computers of tens of …
Wolf 1130: A Nearby Triple System Containing a Cool, Ultramassive White Dwarf
Skiff, Brian A.; Kirkpatrick, J. Davy; Kim, Hwihyun +9 more
Following the discovery of the T8 subdwarf WISE J200520.38+542433.9 (Wolf 1130C), which has a proper motion in common with a binary (Wolf 1130AB) consisting of an M subdwarf and a white dwarf, we set out to learn more about the old binary in the system. We find that the A and B components of Wolf 1130 are tidally locked, which is revealed by the c…
XMM-Newton detection of the 2.1 ms coherent pulsations from IGR J17379-3747
Sanna, A.; Ferrigno, C.; Papitto, A. +7 more
We report the detection of X-ray pulsations at 2.1 ms from the known X-ray burster IGR J17379-3747 using XMM-Newton. The coherent signal shows a clear Doppler modulation from which we estimate an orbital period of 1.9 h and a projected semi-major axis of 8 lt-ms. Taking into account the lack of eclipses (inclination angle of <75°) and assuming …
A Spectral and Timing Study of MAXI J1535-571, Based on Swift/XRT, XMM-Newton, and NICER Observations Obtained in Fall 2017
Stiele, H.; Kong, A. K. H.
We present a spectral-timing analysis of observations taken in fall 2017 of the newly detected X-ray transient MAXI J1535-571. We included 38 Swift/XRT window timing mode observations, 3 XMM-Newton observations, and 31 Neutron star Interior Composition Explorer observations in our study. We computed the fundamental diagrams commonly used to study …
The LatHyS database for planetary plasma environment investigations: Overview and a case study of data/model comparisons
André, N.; Fedorov, A.; Budnik, E. +19 more
We present the Latmos Hybrid Simulation (LatHyS) database, which is dedicated to the investigations of planetary plasma environment. Simulation results of several planetary objects (Mars, Mercury, Ganymede) are available in an online catalogue. The full description of the simulations and their results is compliant with a data model developped in t…
Probing the Southern Fermi Bubble in Ultraviolet Absorption Using Distant AGNs
Jenkins, Edward B.; Jorgenson, Regina A.; Savage, Blair D. +7 more
The Fermi Bubbles are two giant gamma-ray emitting lobes extending 55° above and below the Galactic center. While the Northern Bubble has been extensively studied in ultraviolet (UV) absorption, little is known about the gas kinematics of the southern Bubble. We use UV absorption-line spectra from the Cosmic Origins Spectrograph (COS) on the Hubbl…
Physical properties and chemical composition of the cores in the California molecular cloud
Li, Di; Liu, Tie; Liu, Sheng-Yuan +13 more
Aims: We aim to reveal the physical properties and chemical composition of the cores in the California molecular cloud (CMC), so as to better understand the initial conditions of star formation.
Methods: We made a high-resolution column density map (18.2'') with Herschel data, and extracted a complete sample of the cores in the CMC with …
A Comparative Study of WASP-67 b and HAT-P-38 b from WFC3 Data
Deming, Drake; Stevenson, Kevin B.; Wakeford, Hannah R. +12 more
Atmospheric temperature and planetary gravity are thought to be the main parameters affecting cloud formation in giant exoplanet atmospheres. Recent attempts to understand cloud formation have explored wide regions of the equilibrium temperature-gravity parameter space. In this study, we instead compare the case of two giant planets with nearly id…
Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode
Saio, H.; Bowman, D. M.; Smalley, B. +5 more
We present the results of a multisite photometric observing campaign on the rapidly oscillating Ap (roAp) star 2MASS 16400299-0737293 (J1640; V = 12.7). We analyse photometric B data to show the star pulsates at a frequency of 151.93 d-1 (1758.45 µHz; P = 9.5 min) with a peak-to-peak amplitude of 20.68 mmag, making it one of the h…
CMB constraints on β-exponential inflationary models
Alcaniz, J. S.; Silva, R.; Benetti, M. +2 more
We analyze a class of generalized inflationary models proposed in ref. [1], known as β-exponential inflation. We show that this kind of potential can arise in the context of brane cosmology, where the field describing the size of the extra-dimension is interpreted as the inflaton. We discuss the observational viability of this class of model in li…