Dr Steven Williams

Research Associate

Research Overview

I work on observations of high redshift supernovae, particularly spectroscopy of them and/or their host galaxies. The candidates are discovered by a dedicated Hubble Space Telescope survey, which also follows the discovered candidates in order to obtain a light curve. Spectra are then obtained using world-class instruments such as the Very Large Telescope to determine the redshift. The main goal of this project is to increase the constraints on dark energy at high redshifts. I also work on observations of nearby transients, particularly novae occurring in the Local Group of galaxies.

Multiwavelength observations of the 2015 nova in the Local Group irregular dwarf galaxy IC 1613
Williams, S.C., Darnley, M.J., Henze, M. 1/12/2017 In: Monthly Notices of the Royal Astronomical Society. 472, 2, p. 1300-1314. 15 p.
Journal article

Inflows, Outflows, and a Giant Donor in the Remarkable Recurrent Nova M31N 2008-12a? - Hubble Space Telescope Photometry of the 2015 Eruption
Darnley, M.J., Hounsell, R., Godon, P., Perley, D.A., Henze, M., Kuin, N.P.M., Williams, B.F., Williams, S.C., Bode, M.F., Harman, D.J., Hornoch, K., Link, M., Ness, J.-., Ribeiro, V.A.R.M., Sion, E.M., Shafter, A.W., Shara, M.M. 6/11/2017 In: The Astrophysical Journal. 849, 2, 17 p.
Journal article

Multiwavelength observations of nova SMCN 2016-10a -- one of the brightest novae ever observed
Aydi, E., Page, K.L., Kuin, N.P.M., Darnley, M.J., Walter, F.M., Mróz, P., Buckley, D., Mohamed, S., Whitelock, P., Woudt, P., Williams, S.C., Orio, M., Williams, R.E., Beardmore, A.P., Osborne, J.P., Kniazev, A., Ribeiro, V.A.R.M., Udalski, A., Strader, J., Chomiuk, L. 14/10/2017 In: Monthly Notices of the Royal Astronomical Society.
Journal article

No neon, but jets in the remarkable recurrent nova M31N 2008-12a? - Hubble Space Telescope spectroscopy of the 2015 eruption
Darnley, M.J., Hounsell, R., Godon, P., Perley, D.A., Henze, M., Kuin, N.P.M., Williams, B.F., Williams, S.C., Bode, M.F., Harman, D.J., Hornoch, K., Link, M., Ness, J.-., Ribeiro, V.A.R.M., Sion, E.M., Shafter, A.W., Shara, M.M. 20/09/2017 In: The Astrophysical Journal. 847, 14 p.
Journal article

M31N 2008-12a - the remarkable recurrent nova in M31: Pan-Chromatic observations of the 2015 eruption
Darnley, M.J., Henze, M., Bode, M.F., Hachisu, I., Hernanz, M., Hornoch, K., Hounsell, R., Kato, M., Ness, J.-., Osborne, J.P., Page, K.L., Ribeiro, V.A.R.M., Rodriguez-Gil, P., Shafter, A.W., Shara, M.M., Steele, I.A., Williams, S.C., Arai, A., Arcavi, I., Barsukova, E.A., Boumis, P., Chen, T., Fabrika, S., Figueira, J., Gehrels, N., Godon, P., Goranskij, V.P., Harman, D.J., Hartmann, D.H., Hosseinzadeh, G., Horst, J.C., Itagaki, K., Jose, J., Kabashima, F., Kaur, A., Kawai, N., Kennea, J.A., Kiyota, S., Kucakova, H., Lau, K.M., Maehara, H., Naito, H., Nakajima, K., Nishiyama, K., O'Brien, T.J., Quimby, R., Sala, G., Sano, Y., Sion, E.M., Valeev, A.F., Watanabe, F., Watanabe, M., Williams, B.F., Xu, Z. 20/12/2016 In: The Astrophysical Journal. 833, 2, 38 p.
Journal article

On the progenitors of local group novae. II. the red giant nova rate of M31
Williams, S.C., Darnley, M.J., Bode, M.F., Shafter, A.W. 28/01/2016 In: The Astrophysical Journal. 817, 2, 14 p.
Journal article

A remarkable recurrent nova in M 31: the predicted 2014 outburst in X-rays with Swift
Henze, M., Ness, J., Darnley, M.J., Bode, M.F., Williams, S.C., Shafter, A.W., Sala, G., Kato, M., Hachisu, I., Hernanz, M. 1/08/2015 In: Astronomy and Astrophysics. 580
Journal article

A remarkable recurrent nova in M31: discovery and optical/UV observations of the predicted 2014 eruption
Darnley, M.J., Henze, M., Steele, I.A., Bode, M.F., Ribeiro, V.A.R.M., Rodríguez-Gil, P., Shafter, A.W., Williams, S.C., Baer, D., Hachisu, I., Hernanz, M., Hornoch, K., Hounsell, R., Kato, M., Kiyota, S., Kučáková, H., Maehara, H., Ness, J., Piascik, A.S., Sala, G., Skillen, I., Smith, R.J., Wolf, M. 1/08/2015 In: Astronomy and Astrophysics. 580, 23 p.
Journal article

A luminous red nova in M31 and its progenitor system
Williams, S.C., Darnley, M.J., Bode, M.F., Steele, I.A. 29/05/2015 In: Astrophysical Journal Letters. 805, 2, 6 p.
Journal article

Recurrent novae in M31
Shafter, A.W., Henze, M., Rector, T.A., Schweizer, F., Hornoch, K., Orio, M., Pietsch, W., Darnley, M.J., Williams, S.C., Bode, M.F., Bryan, J. 10/02/2015 In: The Astrophysical Journal Supplement Series. 216, 2, 35 p.
Journal article

On the progenitors of local group novae. I. the M31 catalog
Williams, S.C., Darnley, M.J., Bode, M.F., Keen, A., Shafter, A.W. 25/06/2014 In: The Astrophysical Journal Supplement Series. 213, 1, 27 p.
Journal article

A remarkable recurrent nova in M 31: the X-ray observations
Henze, M., Ness, J., Darnley, M.J., Bode, M.F., Williams, S.C., Shafter, A.W., Kato, M., Hachisu, I. 1/03/2014 In: Astronomy and Astrophysics. 563, 5 p.
Journal article

A remarkable recurrent nova in M 31: the optical observations
Darnley, M.J., Williams, S.C., Bode, M.F., Henze, M., Ness, J., Shafter, A.W., Hornoch, K., Votruba, V. 1/03/2014 In: Astronomy and Astrophysics. 563, 4 p.
Journal article

Rapid dust formation in novae: the speed-class formation timescale correlation eplained
Williams, S.C., Bode, M.F., Darnley, M.J., Evans, A., Zubko, V., Shafter, A.W. 25/10/2013 In: Astrophysical Journal Letters. 777, 2, 4 p.
Journal article