Constraining the Neutron Star Mass in SAX J1808.4-3658 Through a Multicolor Light Curve

Details Constraining the Neutron Star Mass in SAX J1808.4-3658 Through a Multicolor Light Curve Constraining the Neutron Star Mass in SAX J1808.4-3658 Through a Multicolor Light Curve

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..288h&link_type=abstract

NOAO Proposal ID #2008B-0288

Physics

Scientific paper

We will accurately measure the quiescent lightcurve of SAX J1808.4- 3658 (1808), an accreting millisecond pulsar, over 4 orbital periods in two bands. 1808 shows substantial modulation in quiescence in our previous GMOS lightcurve, which we model using the eclipsing light curve model of Orosz et al. Combined with the known orbital parameters of this system, our lightcurve modeling is able to constrain the mass of the neutron star in 1808 to >1.6 M_&sun; at the 3σ level. We propose a longer observation with full orbital coverage in both g' and i' in better seeing conditions, to better constrain the mass of this neutron star.

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