Search Publications
The Herschel Orion Protostar Survey: Far-infrared Photometry and Colors of Protostars and Their Variations across Orion A and B
Henning, Thomas; Manoj, P.; Di Francesco, James +10 more
The degree to which the properties of protostars are affected by environment remains an open question. To investigate this, we look at the Orion A and B molecular clouds, home to most of the protostars within 500 pc. At ∼400 pc, Orion is close enough to distinguish individual protostars across a range of environments in terms of both the stellar a…
X-Ray Emission Evolution of the Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124 during the 2017-2018 Outburst Observed by the MAXI GSC
Makishima, Kazuo; Kawai, Nobuyuki; Oeda, Motoki +3 more
This paper reports on the X-ray emission evolution of the ultraluminous Galactic X-ray pulsar Swift J0243.6+6124 during the giant outburst from 2017 October to 2018 January as observed by the MAXI GSC all-sky survey. The 2-30 keV light curve and the energy spectra confirm the source luminosity LX assuming an isotropic emission reached 2…
A New Parameter of the Photospheric Magnetic Field to Distinguish Eruptive-flare Producing Solar Active Regions
Leka, K. D.; Kusano, Kanya; Lin, Pei Hsuan +3 more
Solar flares and coronal mass ejections (CMEs) are eruptive phenomena caused by coronal magnetic fields. In particular, large eruptive events originate in active regions (AR) with strong surface magnetic fields. However, it is still unclear what determines the capability of an AR to specifically produce eruptive flares and CMEs, and this hinders o…
Estimate of Plasma Temperatures Across a CME-Driven Shock from a Comparison Between EUV and Radio Data
Frassati, Federica; Mancuso, Salvatore; Bemporad, Alessandro
In this work, we analyze the evolution of an EUV wave front associated with a solar eruption that occurred on 30 October 2014, with the aim of investigating, through differential emission measure (DEM) analysis, the physical properties of the plasma compressed and heated by the accompanying shock wave. The EUV wave was observed by the Atmospheric …
SOFIA-EXES Observations of Betelgeuse during the Great Dimming of 2019/2020
Harper, Graham M.; Guinan, Edward F.; Ryde, Nils +5 more
In 2019 October Betelgeuse began a decline in V-band brightness that went beyond the minimum expected from its quasi-periodic ∼420 day cycle, becoming the faintest in recorded photometric history. Observations obtained in 2019 December with Very Large Telescope/SPHERE have shown that the southern half of the star has become markedly fainter than i…
Analysis of eclipsing binaries in multiple stellar systems: the case of V1200 Centauri
Ratajczak, M.; Marques, J. P.; Hełminiak, K. G. +5 more
We present a new analysis of the multiple-star V1200 Centauri based on the most recent observations for this system. We used the photometric observations from the Solaris network and the Transiting Exoplanet Survey Satellite telescope, combined with the new radial velocities from the CHIRON spectrograph and those published in the literature. We co…
Initial Evaluation of SNEMO2 and SNEMO7 Standardization Derived from Current Light Curves of Type Ia Supernovae
Galbany, L.; Sako, M.; Rubin, D. +7 more
To determine if the SuperNova Empirical Model (SNEMO) can improve Type Ia supernova (SN Ia) standardization of several currently available photometric data sets, we perform an initial test, comparing results with the much-used SALT2 approach. We fit the SNEMO light-curve parameters and pass them to the Bayesian hierarchical model UNITY1.2 to estim…
Long-term Photometry and Orbital Period Change of the W UMa-type Binary v0599 Aur: Evidence of about 11 yr Magnetic-activity Cycle
Yu, Yun-Xia; Hu, Ke; Xiang, Fu-Yuan +1 more
Combining all available photometric data from various surveys and literature with our observations, we present 10 sets of light curves for the eclipsing binary V0599 Aur covering a timescale of 20 yr. During the last two decades, the O'Connell effect continuously varied and went through at least two flips between positive and negative effects. The…
Interstellar anatomy of the TeV gamma-ray peak in the IC443 supernova remnant
Marcowith, A.; Gerin, M.; Güsten, R. +11 more
Context. Supernova remnants (SNRs) represent a major feedback source from stars in the interstellar medium of galaxies. During the latest stage of supernova explosions, shock waves produced by the initial blast modify the chemistry of gas and dust, inject kinetic energy into the surroundings, and may alter star formation characteristics. Simultane…
Non-local thermodynamic equilibrium transmission spectrum modelling of HD 209458b
Salz, M.; France, K.; Fossati, L. +3 more
Context. Exoplanetary upper atmospheres are low density environments where radiative processes can compete with collisional ones and introduce non-local thermodynamic equilibrium (NLTE) effects into transmission spectra.
Aims: We develop a NLTE radiative transfer framework capable of modelling exoplanetary transmission spectra over a wide ran…