Search Publications
Testing the CIBER cosmic infrared background measurements and axionlike particles with observations of TeV blazars
Tam, P. H. T.; Zhu, W. S.; Long, G. B. +1 more
The first measurements from the CIBER experiment of extragalactic background light (EBL) in near-infrared (NIR) band exhibit a higher intensity than those inferred through γ -ray observations. Recent theoretical-EBL intensities are typically consistent with the very high energy (VHE) γ -ray observations. Yet, it is possible that the excess NIR rad…
The TOI-763 system: sub-Neptunes orbiting a Sun-like star
Fridlund, M.; Pätzold, M.; Rauer, H. +51 more
We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Tw…
Temporal and Spectral Studies by XMM-Newton of Jupiter's X-ray Auroras During a Compression Event
Coates, A. J.; Jackman, C. M.; Branduardi-Raymont, G. +16 more
We report the temporal and spectral results of the first XMM-Newton observation of Jupiter's X-ray auroras during a clear magnetospheric compression event on June 2017 as confirmed by data from the Jovian Auroral Distributions Experiment (JADE) instrument onboard Juno. The northern and southern auroras were visible twice and thrice respectively as…
OGLE-2017-BLG-0406: Spitzer Microlens Parallax Reveals Saturn-mass Planet Orbiting M-dwarf Host in the Inner Galactic Disk
Soszyński, I.; Szymański, M. K.; Pietrukowicz, P. +100 more
We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary l…
First in situ detection of the CN radical in comets and evidence for a distributed source
Altwegg, Kathrin; Hänni, Nora; Rubin, Martin +4 more
Although the debate regarding the origin of the cyano (CN) radical in comets has been ongoing for many decades, it has yielded no definitive answer to date. CN could previously only be studied remotely, strongly hampering efforts to constrain its origin because of very limited spatial information. Thanks to the European Space Agency's Rosetta spac…
Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II.Kinematics
Luo, Yangping; Németh, Péter; Li, Qida
Combining LAMOST radial velocities with Gaia parallaxes and proper motions, we present 3D Galactic space motions and the orbits of 182 single-lined hot subdwarf stars. These stars were identified by Lei et al. in Gaia DR2 with LAMOST DR6 and DR7 spectra. He-rich hot subdwarf stars with $\mathrm{log}(y)\geqslant 0$ show the largest standard deviati…
A New Candidate Transitional Millisecond Pulsar in the Subluminous Disk State: 4FGL J0407.7-5702
Strader, Jay; Dage, Kristen C.; Chomiuk, Laura +7 more
We report the discovery of a variable optical and X-ray source within the error ellipse of the previously unassociated Fermi Large Area Telescope γ-ray source 4FGL J0407.7-5702. A 22 ks observation from XMM-Newton/European Photon Imaging Camera (EPIC) shows an X-ray light curve with rapid variability and flaring. The X-ray spectrum is well fit by …
Rotational spectral modulation of cloudless atmospheres for L/T brown dwarfs and extrasolar giant planets
Apai, D.; Tremblin, P.; Bonnefoy, M. +5 more
Aims: The rotational spectral modulation (spectro-photometric variability) of brown dwarfs is usually interpreted as a sign indicating the presence of inhomogeneous cloud covers in the atmosphere. This paper is aimed at exploring the role of temperature fluctuations in these spectral modulations. These fluctuations could naturally arise in a …
A Mini-Neptune and a Radius Valley Planet Orbiting the Nearby M2 Dwarf TOI-1266 in Its Venus Zone: Validation with the Habitable-zone Planet Finder
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +26 more
We report on the validation of two planets orbiting the nearby (36 pc) M2 dwarf TOI-1266 observed by the TESS mission. This system is one of a few M dwarf multiplanet systems with close-in planets where the inner planet is substantially larger than the outer planet. The inner planet is sub-Neptune-sized (R = 2.46 ± 0.08 R⊕) with an orbi…
Burst-induced coronal cooling in GS 1826-24. The clock wagging its tail
Sánchez-Fernández, C.; Kuulkers, E.; Poutanen, J. +2 more
Type I X-ray bursts in GS 1826-24, and in several other systems, may induce cooling of the hot inner accretion flow that surrounds the bursting neutron star. Given that GS 1826-24 remained persistently in the hard state over the period 2003-2008 and presented regular bursting properties, we stacked the spectra of the X-ray bursts detected by INTEG…