Search Publications
Doppler confirmation of TESS planet candidate TOI-1408.01: grazing transit and likely eccentric orbit
Galazutdinov, G. A.; Korablev, O.; Yakunin, I. +16 more
We report an independent Doppler confirmation of the TESS planet candidate orbiting an F-type main-sequence star TOI-1408 located 140 pc away. We present a set of radial velocities obtained with a high-resolution fibre-optic spectrograph FFOREST mounted at the SAO RAS 6-m telescope (BTA-6). Our self-consistent analysis of these Doppler data and TE…
Solar Electron Beam Velocities That Grow Langmuir Waves in the Inner Heliosphere
Reid, Hamish A. S.; Lorfing, Camille Y.
Solar accelerated electron beams, a component of space weather, are emitted by eruptive events at the Sun. They interact with the ambient plasma to grow Langmuir waves, which subsequently produce radio emission, changing the electrons' motion through space. Solar electron beam-plasma interactions are simulated using a quasilinear approach to kinet…
Peculiarities of Open Star Clusters with High Vertical Velocities from the Region of the Sco-Cen OB Association
Bobylev, V. V.; Bajkova, A. T.
We have studied the kinematics of a unique sample of young open star clusters (OSCs) with high vertical velocities, $15<W<40$ km s${}^{-1}$. The characteristics of these clusters were taken from the catalogue by Hunt and Reffert (2023), where their mean proper motions, line-of-sight velocities, and distances were calculated using Gaia DR3 da…
VFTS 243 as predicted by the BPASS fiducial models
Eldridge, J. J.; Stevance, H. F.; Ghodla, S. +3 more
The recent discovery of an unambiguous quiescent black hole (BH) and main-sequence O star companion in VFTS 243 opens the door to new constraints on theoretical stellar evolution and population models looking to reproduce the progenitors of BH-BH binaries. Here, we show that the binary population and spectral synthesis fiducial models natively pre…
PM 1-322: New variable planetary nebula
Paunzen, E.; Bernhard, K.; Hümmerich, S. +4 more
Context. Spectra of planetary nebulae (PNe) are characterised by strong forbidden emission lines and often also by an infrared (IR) excess. A few PNe show dust obscuration events and/or harbour long-period binaries. Some post-asymptotic giant branch stars, symbiotic stars, or B[e] stars may feature similar characteristics. Recently, dust clouds ec…
Implications for the Formation of (155140) 2005 UD from a New Convex Shape Model
Fedorets, Grigori; Granvik, Mikael; Kareta, Theodore +15 more
(155140) 2005 UD has a similar orbit to (3200) Phaethon, an active asteroid in a highly eccentric orbit thought to be the source of the Geminid meteor shower. Evidence points to a genetic relationship between these two objects, but we have yet to fully understand how 2005 UD and Phaethon could have separated into this associated pair. Presented he…
The Effelsberg survey of FU Orionis and EX Lupi objects. I. Host environments of FUors and EXors traced by NH3
Menten, K. M.; Ábrahám, P.; Kóspál, Á. +6 more
Context. FU Orionis (FUor) and EX Lupi (EXor) type objects represent two small but rather spectacular groups of low-mass, young, eruptive stars. In both cases, outbursts of several magnitudes are observed, which are attributed to enhanced mass accretion from the circumstellar disc onto the central protostar. Although these objects are well studied…
CCD UBV and Gaia DR3 Analyses of the Open Clusters King 6 and NGC 1605
Sarajedini, Ata; Bilir, Selçuk; Yontan, Talar +5 more
A detailed analysis of ground-based CCD UBV photometry and space-based Gaia Data Release 3 (DR3) data for the open clusters King 6 and NGC 1605 was performed. Using the PYUPMASK algorithm on Gaia astrometric data to estimate cluster membership probabilities, we have identified 112 stars in King 6 and 160 stars in NGC 1605 as the statistically most…
On the role of interplanetary shocks in accelerating MeV electrons
Vainio, R.; Dresing, N.; Morosan, D. E. +2 more
Context. One of the sources of solar energetic particle (SEP) events is shocks that are driven by fast coronal mass ejections (CMEs). They can accelerate SEPs up to relativistic energies and are attributed to the largest SEP events. New studies suggest that CME-driven shocks can potentially accelerate electrons to MeV energies in the vicinity of t…
The Hα and [O III] λ5007 Luminosity Functions of 1.2 < z < 1.9 Emission-line Galaxies from Hubble Space Telescope (HST) Grism Spectroscopy
Gronwall, Caryl; Ciardullo, Robin; Bowman, William P. +2 more
Euclid and the Roman Space Telescope (Roman) will soon use grism spectroscopy to detect millions of galaxies via their Hα and [O III] λ5007 emission. To better constrain the expected galaxy counts from these instruments, we use a vetted sample of 4239 emission-line galaxies from the 3D Hubble Space Telescope survey to measure the Hα and [O III] λ5…