Search Publications
Small-Scale Upflows in a Coronal Hole - Tracked from the Photosphere to the Corona
Barczynski, Krzysztof; Orozco Suárez, David; Mandrini, Cristina H. +4 more
Coronal transients are known as sources of coronal upflows. With the commissioning of Solar Orbiter, it became apparent that coronal small-scale features are even more frequent than previously estimated. It was found that even small coronal features seen by Solar Orbiter can produce visible upflows. Therefore, it is important to study the plasma f…
Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star
Kristiansen, Martti H.; Torres, Guillermo; Hellier, Coel +25 more
We present a validation of a long-period ( ${91.68278}_{-0.00041}^{+0.00032}$ days) transiting sub-Neptune planet, TOI-1221 b (TIC 349095149.01), around a Sun-like (m V = 10.5) star. This is one of the few known exoplanets with a period >50 days, and belongs to the even smaller subset of which have bright enough hosts for detailed …
Are Nonthermal Velocities in Active Region Coronal Loops Anisotropic?
Hahn, Michael; Asgari-Targhi, Mahboubeh; Savin, Daniel Wolf
We have measured line widths in active region coronal loops in order to determine whether the nonthermal broadening is anisotropic with respect to the magnetic field direction. These nonthermal velocities are caused by unresolved fluid motions. Our analysis method combines spectroscopic data and a magnetic field extrapolation. We analyzed spectra …
The shocked molecular layer in RCW 120
Kirsanova, M. S.; Olofsson, A. O. H.; Semenov, D. A. +2 more
Expansion of wind-blown bubbles or H II regions lead to formation of shocks in the interstellar medium, which compress surrounding gas into dense layers. We made spatially and velocity-resolved observations of the RCW 120 photo-dissociation region (PDR) and nearby molecular gas with CO(6-5) and 13CO(6-5) lines and distinguished a bright…
X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data
Dotani, Tadayasu; Yoneyama, Tomokage
2S 0921-630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital period of ~9 d. Past X-ray observations have revealed that 2S 0921-630 has an extended accretion disk corona (ADC), from which most of the X-rays from the system are emitted. We report the result of our Suzaku archival data analysis of 2S 0921-630. The average X-ray spectrum …
New members of the Lupus I cloud based on Gaia astrometry. Physical and accretion properties from X-shooter spectra
Bayo, A.; Alcalá, J. M.; Montalto, M. +13 more
We characterize twelve young stellar objects (YSOs) located in the Lupus I region, spatially overlapping with the Upper Centaurus Lupus (UCL) sub-stellar association. The aim of this study is to understand whether the Lupus I cloud has more members than what has been claimed so far in the literature and gain a deeper insight into the global proper…
J-PLUS: characterization of high-velocity stars in the second data release
Hernández-Monteagudo, C.; Pereira, C. B.; Placco, V. M. +18 more
High-velocity stars in the Milky Way are related to extreme astrophysical phenomena. In this work, we characterize 28 stars with Galactocentric velocities higher than 400 $\mathrm{km\, s^{-1}}$ observed in the Javalambre Photometric Local Universe Survey Data Release 2 (J-PLUS DR2) survey. We combine J-PLUS photometry with astrometric data from th…
Observations of a dust tail gap in comet C/2014 Q1 (PanSTARRS)
Afghan, Qasim; Jones, Geraint H.; Price, Oliver +1 more
Cometary dust tails display a wide array of structures, most believed to be caused by a variable dust production, size distributions, fragmentation processes, and interactions with the solar wind, e.g. Price et al. (2019). However, not all these structures are fully understood. Here we report the discovery of a curious new dust tail feature, first…
Carbonates and ices in the z = 0.89 galaxy-absorber towards PKS 1830-211 and within star-forming regions of the Milky Way
Bowey, Janet E.
A pair of 6.0 and 6.9 µm absorption features are frequently observed in Milky Way (MW) molecular-clouds and YSOs; they also occur in the z = 0.886 rest-frame of a molecule-rich spiral galaxy obscuring blazar PKS 1830-211. I calibrate χ2-fitting methods, which match observations with two or three laboratory spectra. The 6.0-µ…
The Breakthrough Listen Search for Intelligent Life: Nearby Stars' Close Encounters with the Brightest Earth Transmissions
Isaacson, Howard; Derrick, Reilly
After having left the heliosphere, Voyager 1 and Voyager 2 continue to travel through interstellar space. The Pioneer 10, Pioneer 11, and New Horizons spacecraft are also on paths to pass the heliopause. These spacecraft have communicated with the Deep Station Network (DSN) radio antennas in order to download scientific data and telemetry data. Ou…