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Brown dwarfs and very low mass stars in the Praesepe open cluster: a dynamically unevolved mass function?
S. Boudreault, C. A. L. Bailer-Jones, B. Goldman +2
[Abridged] In this paper, we present the results of a photometric survey to identify low mass and brown dwarf members of the old open cluster Praesepe (age of 590[+150][-120]Myr an…
The ILIUM forward modelling algorithm for multivariate parameter estimation and its application to derive stellar parameters from Gaia spectrophotometry
C. A. L. Bailer-Jones
I introduce an algorithm for estimating parameters from multidimensional data based on forward modelling. In contrast to many machine learning approaches it avoids fitting an inver…
A Constraint on brown dwarf formation via ejection: radial variation of the stellar and substellar mass function of the young open cluster IC2391
S. Boudreault, C. A. L. Bailer-Jones
We present the stellar and substellar mass function of the open cluster IC2391, plus its radial dependence, and use this to put constraints on the formation mechanism of brown dwar…
The Milky Way Tomography with SDSS: III. Stellar Kinematics
N. A. Bond, Z. Ivezic, B. Sesar +2
We study Milky Way kinematics using a sample of 18.8 million main-sequence stars with r<20 and proper-motion measurements derived from SDSS and POSS astrometry, including ~170,000…
Towards a library of synthetic galaxy spectra and preliminary results of classification and parametrization of unresolved galaxies for Gaia - II
P. Tsalmantza, M. Kontizas, B. Rocca-Volmerange +8
This paper is the second in a series, implementing a classification system for Gaia observations of unresolved galaxies. Our goals are to determine spectral classes and estimate in…
The evidence for and against astronomical impacts on climate change and mass extinctions: A review
C. A. L. Bailer-Jones
Numerous studies over the past 30 years have suggested there is a causal connection between the motion of the Sun through the Galaxy and terrestrial mass extinctions or climate cha…