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Network Jets as the Driver of Counter-streaming Flows in a Solar Filament/Filament Channel
Tiwari, Sanjiv K.; Panesar, Navdeep K.; Moore, Ronald L. +1 more
Counter-streaming flows in a small (100″ long) solar filament/filament channel are directly observed in high-resolution Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) extreme-ultraviolet (EUV) images of a region of enhanced magnetic network. We combine images from SDO/AIA, SDO/Helioseismic and Magnetic Imager (HMI), and the In…
Scaling K2. II. Assembly of a Fully Automated C5 Planet Candidate Catalog Using EDI-Vetter
Schlieder, Joshua E.; Petigura, Erik A.; Crossfield, Ian J. M. +5 more
We present a uniform transiting exoplanet candidate list for Campaign 5 of the K2 mission. This catalog contains 75 planets with seven multi-planet systems (five double, one triple, and one quadruple planet system). Within the range of our search, we find eight previously undetected candidates, with the remaining 67 candidates overlapping 51% of t…
Space weathering by simulated micrometeorite bombardment on natural olivine and pyroxene: A coordinated IR and TEM study
Hiesinger, Harald; Helbert, Jörn; Weber, Iris +9 more
We studied space-weathering effects caused by micrometeorite bombardment simulated by pulsed intense infrared laser, generating ∼15 mJ per pulse in high vacuum. For our investigation, we selected a natural olivine (San Carlos olivine (Fo91)) and a natural pyroxene (Bamble orthopyroxene (En87)) as important rock forming minera…
The CGM at Cosmic Noon with KCWI: Outflows from a Star-forming Galaxy at z = 2.071
Kacprzak, Glenn G.; Churchill, Christopher W.; Davé, Romeel +3 more
We present the first results from our "CGM at Cosmic Noon with KCWI" program to study gas flows in the circumgalactic medium (CGM) at z = 2-3. Combining the power of a high-resolution VLT/UVES quasar spectrum, a Hubble Space Telescope/Advanced Camera for Surveys image, and integral field spectroscopy with Keck/KCWI (Keck Cosmic Web Imager), we det…
LBT transmission spectroscopy of HAT-P-12b. Confirmation of a cloudy atmosphere with no significant alkali features
Mallonn, M.; Reiners, A.; Apai, D. +10 more
The hot sub-Saturn-mass exoplanet HAT-P-12b is an ideal target for transmission spectroscopy because of its inflated radius. We observed one transit of the planet with the multi-object double spectrograph (MODS) on the Large Binocular Telescope (LBT) with the binocular mode and obtained an atmosphere transmission spectrum with a wavelength coverag…
An Observationally Constrained Analytical Model for Predicting the Magnetic Field Vectors of Interplanetary Coronal Mass Ejections at 1 au
Gopalswamy, Nat; Srivastava, Nandita; Sarkar, Ranadeep
We report on an observationally constrained analytical model, the INterplanetary Flux ROpe Simulator (INFROS), for predicting the magnetic field vectors of coronal mass ejections (CMEs) in the interplanetary medium. The main architecture of INFROS involves using the near-Sun flux rope properties obtained from the observational parameters that are …
A radio polarimetric study to disentangle AGN activity and star formation in Seyfert galaxies
O'Dea, C. P.; Baum, S. A.; Kharb, P. +2 more
To understand the origin of radio emission in radio-quiet active galactic nucleus (AGN) and differentiate between the contributions from star formation, AGN accretion, and jets, we have observed a nearby sample of Seyfert galaxies along with a comparison sample of starburst galaxies using the Expanded Very Large Array (EVLA) in full-polarization m…
The Most Metal-poor Stars in the Inner Bulge
Casey, Andrew R.; Ji, Alexander P.; Reggiani, Henrique +1 more
The bulge is the oldest component of the Milky Way. Since numerous simulations of Milky Way formation have predicted that the oldest stars at a given metallicity are found on tightly bound orbits, the Galaxy's oldest stars are likely metal-poor stars in the inner bulge with small apocenters (i.e., Rapo ≲ 4 kpc). In the past, stars with …
A stellar census in globular clusters with MUSE. Extending the CaT-metallicity relation below the horizontal branch and applying it to multiple populations
Brinchmann, Jarle; Weilbacher, Peter M.; Kamann, Sebastian +7 more
Aims: We use the spectra of more than 30 000 red giant branch (RGB) stars in 25 globular clusters (GC), obtained within the MUSE survey of Galactic globular clusters, to calibrate the Ca II triplet metallicity relation and derive metallicities for all individual stars. We investigate the overall metallicity distributions as well as those of t…
Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068
Fox, O. D.; Zhang, X.; Reichart, D. E. +46 more
We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual SNe II that exploded in NGC 1068 (D = 10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope frequently, with four clear slope changes in the first 30 days of evolution. This rapidly changing light curve indicates that interacti…