Search Publications
Morphology and Dynamics of Venus's Middle Clouds With Akatsuki/IR1
Hueso, R.; Sánchez-Lavega, A.; Kardasis, E. +8 more
The Venusian atmosphere is covered by clouds with superrotating winds whose accelerating mechanism is still not well understood. The fastest winds, occurring at the cloud tops (∼70-km height), have been studied for decades, thanks to their visual contrast in dayside ultraviolet images. The middle clouds (∼50-55 km) can be observed at near-infrared…
Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys
Minniti, Dante; Alonso-García, Javier; Luna, Alonso
We propose a new way to search for hypervelocity stars (HVS) in the Galactic bulge, by using red clump (RC) giants, that are good distance indicators. The second Gaia Data Release and the near-IR data from the VISTA Variables in the Via Lactea (VVV) Survey led to the selection of a volume limited sample of 34 bulge RC stars. A search in this combi…
Detecting dark photon dark matter with Gaia-like astrometry observations
Yuan, Qiang; Zhao, Yue; Guo, Huai-Ke +3 more
A class of dark photon dark matter models with ultralight masses would lead to oscillation of a test body through a coupling with baryons or B-L charge. This periodical oscillation of an observer results in swing of a star's apparent position due to the effect of aberration of light, which could be probed with high-precision astrometry observation…
Impact of substructure on local dark matter searches
Ibarra, Alejandro; Kavanagh, Bradley J.; Rappelt, Andreas
Dark matter substructure can contribute significantly to local dark matter searches and may provide a large uncertainty in the interpretation of those experiments. For direct detection experiments, sub-halos give rise to an additional dark matter component on top of the smooth dark matter distribution of the host halo. In the case of dark matter c…
Pulse frequency fluctuations of magnetars
Serim, M. M.; Şahiner, Ş.; Inam, S. ć. +2 more
Using RXTE, Chandra, XMM-Newton and Swift observations, we construct the power spectra and torque noise strengths of magnetars for the first time. For some of the sources, on time-scales of months to years, we measure strong red noise that might be a consequence of their outbursts. We compare the noise strengths of magnetars with those of radio pu…
The host galaxies of luminous type 2 AGNs at z ∼ 0.3-0.4
Koekemoer, A. M.; Carrera, F. J.; Huertas-Company, M. +7 more
We study the morphological and structural properties of the host galaxies associated with 57 optically selected luminous type 2 active galactic nuclei (AGNs) at z ∼ 0.3-0.4: 16 high-luminosity Seyfert 2 [HLSy2, 8.0 ≤ log(L_[O III]/L_{⊙}) < 8.3] and 41 obscured [QSO2, log(L_[O III]/L_{⊙})≥ 8.3] quasars. With this work, the total number of QSO2s …
CLIcK: a Continuum and Line fItting Kit for circumstellar disks
Pascucci, Ilaria; Henning, Thomas; Liu, Yao
Infrared spectroscopy with medium to high spectral resolution is essential to characterize the gas content of circumstellar disks. Unfortunately, conducting continuum and line radiative transfer of thermochemical disk models is too time-consuming to carry out large parameter studies. Simpler approaches using a slab model to fit continuum-subtracte…
Vibrational and electronic collisional-radiative model in CO2-N2-Ar mixtures for Mars entry problems
Annaloro, Julien; Bultel, Arnaud
To predict the nonequilibrium flows around a hypersonic vehicle entering the Martian atmosphere, the two-temperature collisional-radiative model "CoRaM-MARS" has been developed. The species CO2, CO, C2, CN, N2, NO, O2, C, N, O, Ar, CO+, C2 + , CN+, N…
Optical detection of the black widow binary PSR J2052+1219
Zharikov, S.; Deneva, J. S.; Kirichenko, A. +2 more
We present optical time-resolved multiband photometry of the black widow binary millisecond pulsar J2052+1219 using direct-imaging observations with the 2.1-m telescope of the Observatorio Astronomico Nacional San Pedro Mártir (OAN-SPM), Mexico. The observations reveal a variable optical source whose position and periodicity, P = 2.752 h, coincide…
WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South
Bouchy, F.; Queloz, D.; Ségransan, D. +21 more
We present the discovery of four new giant planets from the Wide Angle Search for Planets-South (WASP-South), three hot Jupiters and one bloated sub-Saturn mass planet: WASP-169b, WASP-171b, WASP-175b, and WASP-182b. Besides the discovery photometry from WASP-South we use radial velocity measurements from CORALIE and HARPS and follow-up photometry…