Publications (23)
Small deviations in p-variation norm for multidimensional Levy processes
T. Simon
Let Z be an Rd-valued Levy process with strong finite p-variation for some p<2. We prove that the ''decompensated'' process Y obtained from Z by annihilating its generalized drift…
Enhanced X-ray variability from V1647 Ori, the young star in outburst illuminating McNeil's Nebula
N. Grosso, J. H. Kastner, H. Ozawa +5
We report a ~38 ks X-ray observation of McNeil's Nebula obtained with XMM on 2004 April 4. V1647 Ori, the young star in outburst illuminating McNeil's Nebula, is detected with XMM…
CO Line Emission and Absorption from the HL Tau Disk: Where is all the dust?
S. Brittain, T. Rettig, T. Simon +1
We present high-resolution infrared spectra of HL Tau, a heavily embedded young star. The spectra exhibit broad emission lines of hot CO gas as well as narrow absorption lines of c…
Validation of the DESI DR2 Ly forest full-shape analysis
M. Herbold, A. Cuceu, P. Martini +107
The paper validates the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 analysis of the Lyman‑α forest, focusing on extracting the Alcock‑Paczynski (AP) measurement from…
DESI DR2 Results IV: Alcock-Paczyński Measurements from the Lyman Alpha Forest and Cosmological Constraints
DESI Collaboration, A. G. Adame, J. Aguilar +164
The DESI DR2 analysis measures the Alcock‑Paczynski effect using the full shape of Lyman‑α forest auto‑ and cross‑correlations, achieving 1% precision at redshift 2.33 and providin…
FUSE observations of molecular hydrogen on the line of sight towards HD141569A
C. Martin-Zaidi, M. Deleuil, T. Simon +5
We present an analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of HD141569A, a transitional object known to possess a circumstellar disk. We observe two compo…
Statistical properties of visual binaries as tracers of the formation of young stellar clusters
G. Duchene, J. Bouvier, J. Eisloffel +1
In this review, we summarize the observed statistical properties of visual binaries in various young stellar clusters. The binary frequency, orbital period distribution and mass ra…
Beta-weighted non-local differential operators and related stochastic processes
L. Beghin, N. Leonenko, T. Simon +1
In this work we introduce a class of non-local differential operators defined through a beta-weighted averaging of the ordinary derivative. We investigate their analytical properti…
Visual binaries among high-mass stars - An adaptive optics survey of OB stars in the NGC 6611 cluster
G. Duchene, T. Simon, J. Eisloffel +1
We have searched for visual binaries with projected separations in the range 200-3000 AU (0.1"-1.5") among a sample of 96 stars in the massive young NGC 6611 cluster, 60 of them be…
V1647 Ori: The X-ray Evolution of a Pre-main Sequence Accretion Burst
J. H. Kastner, M. Richmond, N. Grosso +6
We present Chandra X-ray Observatory monitoring observations of the recent accretion outburst displayed by the pre-main sequence (pre-MS) star V1647 Ori. The X-ray observations wer…
An X-ray Outburst from the Rapidly Accreting Young Star That Illuminates McNeil's Nebula
J. H. Kastner, M. Richmond, N. Grosso +6
Young, low-mass stars are luminous X-ray sources whose powerful X-ray flares may exert a profound influence over the process of planet formation. The origin of such emission is unc…
CoLoRe-2LPT: Lyman- mock catalogues for the validation of DESI cosmological analyses
M. F. Ruiz-Herrera Bernal, S. Avila, A. Font-Ribera +90
The paper presents fast Lyman‑α forest mock catalogues generated with second‑order Lagrangian perturbation theory (2LPT) that accurately reproduce small‑scale clustering, BAO broad…
Multi-Site observations of SU Aurigae
Y. C. Unruh, J. -F. Donati, J. M. Oliveira +20
We present results from the 1996 MUSICOS (MUlti-SIte COntinuous Spectroscopy) campaign on the T Tauri star SU Aurigae. We find a 2.7-d periodicity in the He I (587.6 nm) line and s…
Search for solid HDO in low-mass protostars
B. Parise, T. Simon, E. Caux +4
We present ground-based 2.1 to 4.2 microns observations of four low-mass protostars. We searched for the 4.1 microns OD stretch band, characteristic of solid HDO in grain mantles.…
Small deviations in p-variation for stable processes
T. Simon
Let be a strictly stable process on with index . We prove that for every , there exists and $\k = \k (α, p)\in (0, +\i…
Near Infrared Spectroscopic Study of V1647 Ori
S. D. Brittain, T. W. Rettig, T. Simon +2
We present new high-resolution infrared echelle spectra of V1647 Ori, the young star that illuminates McNeil's nebula. From the start, V1647 Ori has been an enigmatic source that h…
O VI Observations of the Onset of Convection Zones in Main-Sequence A Stars
J. E. Neff, T. Simon
If magnetic activity in outer stellar atmospheres is due to an interplay between rotation and subsurface convection, as is generally presumed, then one would not expect to observe…
Near-Infrared Spectroscopy of McNeil's Nebula Object
W. D. Vacca, M. C. Cushing, T. Simon
We present 0.8-5.2 micron spectroscopy of the compact source at the base of a variable nebula (McNeil's Nebula Object) in the Lynds 1630 dark cloud that went into outburst in late…
Convection, Thermal Bifurcation, and the Colors of A stars
T. Simon, W. B. Landsman
Broad-band ultraviolet photometry from the TD-1 satellite and low dispersion spectra from the short wavelength camera of IUE have been used to investigate a long-standing proposal…
Radio Frequency Models of Novae in eruption. I. The Free-Free Process in Bipolar Morphologies
V. A. R. M. Ribeiro, L. Chomiuk, U. Munari +6
Observations of novae at radio frequencies provide us with a measure of the total ejected mass, density profile and kinetic energy of a nova eruption. The radio emission is typical…
The formation and evolution of binary systems. III. Low-mass binaries in the Praesepe cluster
J. Bouvier, G. Duchene, J. -C. Mermilliod +1
With the aim of investigating the binary population of the 700 Myr old Praesepe cluster, we have observed 149 G and K-type cluster members using adaptive optics. We detected 26 bin…
X-Ray and Infrared Observations of Embedded Young Stars in L1630
T. Simon, S. M. Andrews, J. T. Rayner +1
The HH 24-26 star-forming region within the L1630 dark cloud in Orion contains a remarkable collection of rare Class 0 and Class I protostars, collimated molecular and ionized jets…
Coronae of Cool Stars
M. Audard, S. A. Drake, M. Güdel +6
We present preliminary results of grating observations of YY Mensae and V824 Arae by Chandra and XMM-Newton. Spectral features are presented in the context of the emission measure…