Search Publications
Evolution of the atomic component in protostellar outflows
Eislöffel, J.; Krabbe, A.; Nisini, B. +3 more
Context. We present SOFIA/FIFI-LS observations of three Class 0 and one Class I outflows (Cep E, HH 1, HH 212, and L1551 IRS5) in the far-infrared [O I]63 µm and [O I]145 µm transitions. Spectroscopic [O I]63 µm maps enabled us to infer the spatial extent of warm (T ∼ 500−1200 K), low-excitation a…
Toward a 3D kinetic tomography of Taurus clouds. I. Linking neutral potassium and dust
Hottier, C.; Lallement, R.; Vergely, J. L. +1 more
Context. Gaia parallaxes and photometric measurements open a three-dimensional (3D) era for the Milky Way, including its interstellar (IS) matter. Three-dimensional Galactic dust distributions are constructed in various ways, based on Gaia data and photometric or spectroscopic surveys.
Aims: The assignment of radial motions to IS dust structu…
Simultaneous photometric and CARMENES spectroscopic monitoring of fast-rotating M dwarf GJ 3270. Discovery of a post-flare corotating feature
Amado, P. J.; Caballero, J. A.; Czesla, S. +33 more
Context. Active M dwarfs frequently exhibit large flares, which can pose an existential threat to the habitability of any planet in orbit in addition to making said planets more difficult to detect. M dwarfs do not lose angular momentum as easily as earlier-type stars, which maintain the high levels of stellar activity for far longer. Studying you…
The Common Origin of High-energy Protons in Solar Energetic Particle Events and Sustained Gamma-Ray Emission from the Sun
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +2 more
We report that the number of >500 MeV protons (Ng) inferred from sustained gamma-ray emission (SGRE) from the Sun is significantly correlated with that of protons propagating into space (NSEP) as solar energetic particles (SEPs). Under the shock paradigm for SGRE, shocks driven by coronal mass ejections (CMEs) accelerate h…
HAWC Search for High-mass Microquasars
Lee, W. H.; Alvarez, C.; Hernandez, S. +86 more
Microquasars with high-mass companion stars are promising very high energy (VHE; 0.1-100 TeV) gamma-ray emitters, but their behaviors above 10 TeV are poorly known. Using the High Altitude Water Cerenkov (HAWC) observatory, we search for excess gamma-ray emission coincident with the positions of known high-mass microquasars (HMMQs). No significant…
KMT-2019-BLG-0797: Binary-lensing event occurring on a binary stellar system
Han, Cheongho; Lee, Chung-Uk; Zang, Weicheng +18 more
Aims: We analyze the microlensing event KMT-2019-BLG-0797. The light curve of the event exhibits two anomalous features from a single-lens single-source model, and we aim to reveal the nature of the anomaly.
Methods: It is found that a model with two lenses plus a single source (2L1S model) can explain one feature of the anomaly, but the…
An intriguing globular cluster in the Galactic bulge from the VVV survey
Minniti, D.; Saito, R. K.; Alonso-García, J. +7 more
Context. Globular clusters (GCs) are the oldest objects known in the Milky Way, so each discovery of a new GC is astrophysically important. In the inner Galactic bulge regions these objects are difficult to find due to extreme crowding and extinction. However, recent near-IR surveys have discovered a number of new bulge GC candidates that need to …
Formation of Multiple Populations of M5 (NGC 5904)
Lee, Jae-Woo
With our new Ca-CN-CH-NH photometry, we revisit the globular cluster (GC) M5. We find that M5 is a mono-metallic GC with a small metallicity dispersion. Our carbon abundances show that the σ[C/Fe] of the M5 CN-s population, with depleted carbon and enhanced nitrogen abundances, is significantly large for a single stellar population. Our new analys…
Tracing the Origin of Moving Groups. III. Detecting Moving Groups in LAMOST DR7
Zhao, Gang; Yang, Yong; Zhao, Jingkun +2 more
We revisit the moving groups (MGs) in the solar neighborhood with a sample of 91,969 nearby stars constructed from LAMOST DR7. Using the wavelet technique and Monte Carlo simulations, five MGs together with a new candidate located at V≃-130 km s-1 are detected simultaneously in $V-\sqrt{{U}^{2}+2{V}^{2}}$ space. Taking into account the …
Resolving the Circumstellar Environment of the Galactic B[e] Supergiant Star MWC 137.II. Nebular Kinematics and Stellar Variability
Liimets, Tiina; Kraus, Michaela; Jones, David +4 more
The Galactic B[e] supergiant MWC 137 is surrounded by a large-scale optical nebula. To shed light on the physical conditions and kinematics of the nebula, we analyze the optical forbidden emission lines [N II] λλ 6548,6583 and [S II] λλ 6716,6731 in long-slit spectra taken with ALFOSC at the Nordic Optical Telescope. The radial velocities display …