Variables Found in White Dwarf Survey

in #astrosteem3 years ago (edited)


Figure 1. Color-color diagrams showing the 49 variable objects as well as the non-variable objects. Credit: Dame et al. 2019

Astronomers recently submitted their findings identifying 49 new variable objects of which 40 are new systems to the Monthly Notices of the Royal Astronomical Society Journal (see Figure 1). Searching for variability over short time frames is a relatively new area of exploration that is enabled by large surveys searching for specific things like the optical counterparts to gravitational wave events, planetary transits, or supernovae. This study made use of the Dark Energy Camera (DECam), a 520 megapixel CCD camera on a 4 meter telescope in northern Chile. The study targeted 31,732 point sources in a 3 square degrees area over 8 consecutive nights. Specifically, the survey was looking for planetary transits around white dwarfs by taking images about every 90 seconds. Although no planets were found transiting white dwarfs, all the photometry was further analyzed to figure out which type variables they were. The variables discovered included twenty-three detached or contact binaries (see Figure 2), one eclipsing white dwarf, sixteen delta Scuti (see Figure 3), three RR Lyrae (see Figure 4), and two ZZ Ceti. These results highlight the ability of large, short time frame surveys to uncover interesting results, regardless of the intended target.


Figure 2. Light curves in the top two panels are contact binaries while the bottom panel is a detached binary. Credit: Dame et al. 2019


Figure 3. Phase folded light curves for delta Scuti variables. Credit: Dame et al. 2019


Figure 4. Phase folded light curves for RR Lyrae variables. Credit: Dame et al. 2019


Dame et al. (2019).


This post has been voted on by the SteemSTEM curation team and voting trail in collaboration with @utopian-io and @curie.

If you appreciate the work we are doing then consider voting all three projects for witness by selecting stem.witness, utopian-io and curie!

For additional information please join us on the SteemSTEM discord and to get to know the rest of the community!

Welcome to Steemit and steemSTEM!

Check us on Discord, , where you will find some cool people, guidelines and very solid fun

Astro community is very active: @terrylovejoy , @astromaniac , @svemirac , @rifkan ...

Thanks, I'll check it out

Hi @ptsouth97!

Your post was upvoted by in cooperation with @steemstem - supporting knowledge, innovation and technological advancement on the Steem Blockchain.

Contribute to Open Source with

Learn how to contribute on our website and join the new open source economy.

Want to chat? Join the Utopian Community on Discord

Coin Marketplace

STEEM 0.28
TRX 0.08
JST 0.042
BTC 30012.85
ETH 2011.66
USDT 1.00
SBD 2.75