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- Publications
- Influence
Evidence for a Massive Neutron Star from a Radial-velocity Study of the Companion to the Black-widow Pulsar PSR B1957+20
- M. Kerkwijk, R. Breton, S. Toronto, Caltech
- Physics
- 28 September 2010
The most massive neutron stars constrain the behavior of ultra-dense matter, with larger masses possible only for increasingly stiff equations of state. Here, we present evidence that the black-widow… Expand
The mass of the neutron star in Vela X-1
- O. Barziv, L. Kaper, M. Kerkwijk, J. Telting, J. Paradijs
- Physics
- 14 August 2001
We measured the radial-velocity curve of HD 77581, the B-supergiant companion of the X-ray pulsar Vela X-1, using 183 high-resolution optical spectra obtained in a nine-month campaign. We derive… Expand
The Variable Radio-to-X-Ray Spectrum of the Magnetar XTE J1810–197
We have observed the 5.54 s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its broadband spectrum. At the IRAM 30 m… Expand
The Spectrum of the Brown Dwarf Gliese 229B
- B. Oppenheimer, S. Kulkarni, K. Matthews, M. Kerkwijk
- Physics
- 23 February 1998
We present a spectrum of the cool K) brown dwarf Gliese 229B. This spectrum, with a (T eff \ 900 relatively high signal-to-noise ratio per spectral resolution element spans the wavelength range… Expand
The Masses of the Millisecond Pulsar J1012+5307 and Its White Dwarf Companion
- M. Kerkwijk, P. Bergeron, S. Kulkarni
- Physics
- 7 June 1996
We report on spectroscopy of the white dwarf companion of the millisecond radio pulsar PSR J1012+5307. We find strong Balmer absorption lines, as would be expected for a cool DA white dwarf. The… Expand
A Multiplicity Census of Young Stars in Chamaeleon I
- D. Lafrenìere, R. Jayawardhana, A. Brandeker, Mirza Ahmic, M. Kerkwijk
- Physics
- 4 March 2008
We present the results of a multiplicity survey of 126 stars spanning ~0.1-3 solar masses in the ~2-Myr-old Chamaeleon I star-forming region, based on adaptive optics imaging with the ESO Very Large… Expand
The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package
- The Astropy Collaboration, A. Price-Whelan, +134 authors V. Zabalza
- Physics
- 8 January 2018
The Astropy Project supports and fosters the development of open-source and openly developed Python packages that provide commonly needed functionality to the astronomical community. A key element of… Expand
Direct Imaging and Spectroscopy of a Planetary-Mass Candidate Companion to a Young Solar Analog
- D. Lafrenìere, R. Jayawardhana, M. Kerkwijk
- Physics
- 8 September 2008
We present Gemini near-infrared adaptive optics imaging and spectroscopy of a planetary-mass candidate companion to 1RXS J160929.1–210524, a roughly solar-mass member of the 5 Myr old Upper Scorpius… Expand
An optical counterpart to the anomalous X-ray pulsar 4U0142+61
- F. Hulleman, M. Kerkwijk, S. Kulkarni
- Physics, Medicine
- Nature
- 30 November 2000
The energy source of the anomalous X-ray pulsars (AXPs) is not understood, hence their designation as anomalous. Unlike binary X-ray pulsars, no companions are seen, so the energy cannot be supplied… Expand
Lithium Depletion of Nearby Young Stellar Associations
- E. Mentuch, A. Brandeker, +6 authors Hamburger Sternwarte
- Physics
- 26 August 2008
We estimate cluster ages from lithium depletion in five pre-main-sequence groups found within 100 pc of the Sun: the TW Hydrae association, η Chamaeleontis cluster, β Pictoris moving group,… Expand