High speed photometry of the new AM CVn star in Hya (previously known as
SN2003aw), spectroscopically identified by Chornock & Filippenko, shows it to
have a superhump period of 2041.5 +/- 0.3 s. We find a range of brightness from
V ~ 16.5 to 20.3, presumably caused by variations in the rate of mass transfer.
In the intermediate state the system cycles in brightness with a period of ~ 16
h and range >= 0.4 mag. There are sidebands to the principal frequencies in the
Fourier transform which have constant frequency difference from the superhump
harmonics.Comment: 5 pages, 6 figures. Accepted for publication in MNRA