Evidence for supernova-synthesized dust from the rising afterglow of GRB071025 at z ~ 5

Details Evidence for supernova-synthesized dust from the rising afterglow of GRB071025 at z ~ 5 Evidence for supernova-synthesized dust from the rising afterglow of GRB071025 at z ~ 5

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.406.2473p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 406, Issue 4, pp. 2473-2487.

Astronomy and Astrophysics

Astronomy

23

Dust, Extinction, Gamma-Ray Burst: General, Gamma-Ray Burst: Individual: 071025

Scientific paper

We present observations and analysis of the broad-band afterglow of Swift GRB071025. Using optical and infrared (RIYJHK) photometry, we derive a photometric redshift of 4.4 < z < 5.2; at this redshift our simultaneous multicolour observations begin at ~30 s after the gamma-ray burst trigger in the host frame, during the initial rising phase of the afterglow. We associate the light-curve peak at ~580 s in the observer frame with the formation of the forward shock, giving an estimate of the initial Lorentz factor Γ0 ~ 200. The red spectral energy distribution (even in regions not affected by the Lyman α break) provides secure evidence of a large dust column. However, the inferred extinction curve shows a prominent flat component between 2000 and 3000 Å in the rest frame, inconsistent with any locally observed template but well fitted by models of dust formed by supernovae. Time-dependent fits to the extinction profile reveal no evidence of dust destruction and limit the decrease in the extinction column to ΔA3000 < 0.54 mag after t = 50 s in the rest frame. Together with studies of high-z quasars, our observations suggest a transition in dust properties in the early Universe, possibly associated with a transition between supernova-dominated and asymptotic giant branch-dominated modes of dust production.

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