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X-exoplanets coronal models and planet photoevaporation
Sanz-Forcada, Jorge
Investigation of the Timing and Spectral Properties of an Ultraluminous X-Ray Pulsar NGC 7793 P13
Hu, Chin-Ping; Kong, A. K. H.; Hui, C. Y. +3 more
We perform both timing and spectral analyses using the archival X-ray data taken with Swift, XMM-Newton, NICER, and NuSTAR from 2016 to 2020 to study an ultraluminous pulsar, NGC 7793 P13, that showed a long period of super-Eddington accretion. We use the Rayleigh test to investigate the pulsation at different epochs, and confirm the variation of …
Sequential Star Formation in the Young SMC Region NGC 602: Insights from ALMA
Bolatto, Alberto D.; Meixner, Margaret; Sabbi, Elena +7 more
NGC 602 is a young, low-metallicity star cluster in the "Wing" of the Small Magellanic Cloud. We reveal the recent evolutionary past of the cluster through analysis of high-resolution (~0.4 pc) Atacama Large Millimeter/submillimeter Array observations of molecular gas in the associated H II region N90. We identify 110 molecular clumps (R < 0.8 …
An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk
Pascucci, Ilaria; Banzatti, Andrea; Carmona, Andrés +7 more
We present an analysis of an unusual pattern of water vapor emission from the ~2 Myr old low-mass binary system VV CrA, as observed in IR spectra obtained with VLT-CRIRES, VLT-VISIR, and Spitzer-IRS. Each component of the binary shows emission from water vapor in both the L (~3 µm) and N (~12 µm) bands. The N-band and Spitzer spectra a…
Investigating a predicted metallicity [Fe/H] variation in the Type II Globular Cluster NGC 362
Sarajedini, Ata; Monaco, L.; Geisler, D. +4 more
NGC 362 is a non-common Type II Galactic globular cluster, showing a complex pseudo two-colour diagram or 'chromosome map'. The clear separation of its stellar populations in the colour-magnitude diagram and the distribution of the giant stars in the chromosome map strongly suggests that NGC 362 could host stars with both cluster-nominal, as well …
Spatially Resolved X-Ray Study of Supernova Remnant G306.3-0.9 with Unusually High Calcium Abundance
Toonen, Silvia; Nomoto, Ken'ichi; Vink, Jacco +6 more
G306.3-0.9 is an asymmetric Galactic supernova remnant (SNR), whose progenitor has been thought to be a Type Ia supernova (SN), but its high Ca abundance appears inconsistent with the Type Ia origin. Hoping to uncover the reason for its asymmetry and the origin of this SNR, we performed a spatially resolved X-ray spectroscopic analysis of XMM-Newt…
The missing radial velocities of Gaia: Blind predictions for DR3
Widmark, Axel; Naik, Aneesh P.
While Gaia has observed the phase space coordinates of over a billion stars in the Galaxy, in the overwhelming majority of cases it has only obtained five of the six coordinates, the missing dimension being the radial (line-of-sight) velocity. Using a realistic mock data set, we show that Bayesian neural networks are highly capable of 'learning' t…
Doppler shifts of spectral lines formed in the solar transition region and corona
Chen, Yajie; Tian, Hui; Peter, Hardi +2 more
Context. Emission lines formed in the transition region and corona dominantly show redshifts and blueshifts, respectively.
Aims: We investigate the Doppler shifts in a 3D radiation magnetohydrodynamic (MHD) model of the quiet Sun and compare these to observed properties. We concentrate on Si IV 1394 Å originating in the transition region and …
Counterparts of candidate dusty starbursts at z > 6
Yan, Haojing; Ling, Chenxiaoji; Ma, Zhiyuan
We present an analysis of the optical-to-near-infrared (IR) counterparts of a sample of candidate dusty starbursts at z > 6. These objects were pre-selected based on the rising trend of their far-IR-to-sub-millimeter spectral energy distributions and the fact that they are radio-weak. Their precise positions are available through millimeter and…
A search for period changes of eight short-period Type II Cepheids
Whitelock, Patricia A.; Kniazev, Alexei Y.; Yacob, Alemiye M. +2 more
In this study, we investigate the period changes of eight short-period Type II Cepheids of the BL Her subtype, i.e. with periods in the 1-4 d range. The O - C diagrams for these stars are constructed using all suitable observational data from ground and space surveys. This spans a time interval of over one century and includes digitized photograph…