Search Publications
DW Cancri in X-rays
Conversi, L.; Nucita, A. A.; Licchelli, D.
We report on the XMM-Newton observation of DW Cnc, a candidate intermediate polar candidate whose historical optical light curve shows the existence of periods at ≃38, ≃86, and ≃69 min, which were interpreted as the white dwarf spin, the orbital and the spin-orbit beat periodicities. By studying the 0.3-10 keV light curves, we confirm the existenc…
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 …
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…
On the photometric signature of fast rotators
Girardi, Léo; Marigo, Paola; Bellini, Andrea +4 more
Rapidly rotating stars have been recently recognized as having a major role in the interpretation of colour-magnitude diagrams of young and intermediate-age star clusters in the Magellanic Clouds and in the Milky Way. In this work, we evaluate the distinctive spectra and distributions in colour-colour space that follow from the presence of a subst…
Recognition of M-type stars in the unclassified spectra of LAMOST DR5 using a hash-learning method
Luo, A. -L.; Chen, J. -J.; Du, B. +6 more
Our study aims to recognize M-type stars which are classified as `UNKNOWN' due to poor quality in the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR5 V1. A binary nonlinear hashing algorithm based on Multi-Layer Pseudo-Inverse Learning (ML-PIL) is proposed to effectively learn spectral features for M-type-star detection, whi…
Radical-assisted polymerization in interstellar ice analogues: formyl radical and polyoxymethylene
Duvernay, F.; Danger, G.; Chiavassa, T. +5 more
We present new laboratory experiments on the low-temperature formation of complex organic molecules (COMs) such as polyoxymethylene (POM), glycolaldehyde, ethylene glycol, and possibly glyceraldehyde and glycerol through radical-induced reactivity from vacuum ultraviolet (VUV) photolysis of formaldehyde in Ar and Xe matrices. The radical reactivit…
Multidisciplinary analysis of the Hapi region located on Comet 67P/Churyumov-Gerasimenko
Lamy, P. L.; Lara, L. M.; Shi, X. +44 more
By using the Rosetta/OSIRIS-NAC data set taken in 2014 August, we focus on the neck region, called Hapi, located on 67P Churyumov-Gerasimenko's Northern hemisphere. The gravitational potential and slopes of Hapi, coupled with the geological unit identification and the boulder size-frequency distributions, support the interpretation that both talus…
Development of models for nearbaby young stellar moving groups: creation, revision, and finalization of the models
Song, Inseok; Lee, Jinhee
In our previous research, we developed a tool for calculating Bayesian membership probability for nearby young stellar moving groups (BAMG: Bayesian Analysis of Moving Groups). The study presented the importance of careful construction of models in moving group membership assessment, using β Pictoris moving group as a test case. In this study, we …