Young Stellar Objects
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by TED91
I came across with several stars with interesting light curves. They turned out to be Young Stellar Objects. @davidbundy77 made a collection of them and I tried to find out if they really are YSOs and if they have a known disk. Almost all of them are known YSOs with disks. List is below.
We should be able to see some transitional disks. In (Scott+, 2014) you can read about how it can look like.
Some examples are discuss here and here on page 3.
EPIC; 2MASS ID; PH ID; SpType; known disk or IR excess Y/N; notes
204514546; 15564002-2201400; APH0000j6i; A8Ve; Y (VAN DER PLAS+, 2015); Herbig Ae/Be star
203429083; 15570350-2610081; APH0000fcx; Unknown; Unknown;
204278916; 16020757-2257467; APH0000idp; M2.5; Y (Luhman+, 2012); T Tauri star
204248645; 16024575-2304509; APH0000ia6; M5; Y (Luhman+, 2012); T Tauri star, binary system
204489514; 16030161-2207523; APH0000j3m; M4.75; Y (Luhman+, 2012); T Tauri star
204856827; 16065937-2032572; APH0000k59; M2.5; Y (Luhman+, 2012); T Tauri star, binary system
205519771; 16071403-1702425; APH0000mom; M3.5; Y (Rizzuto+, 2015); T Tauri star
205080616; 16082324-1930009; APH0000ldb; K9; Y (Luhman+, 2012); T Tauri star, NErn of 13" cpm pair
204472612; 16083419-2211588; APH0000j1m; M5.25-M5; Y; T Tauri star
204630363; 16100501-2132318; APH0000jkp; M0.0; Y (Rizzuto+, 2015); T Tauri star
204530046; 16105011-2157481;APH0000j8d; Unknown; Unknown
204932990; 16115091-2012098; APH0000kk3; M3.5; Y (Luhman+, 2012); T Tauri star
204399980; 16131158-2229066; APH0000iry; A8IVe; Y (Luhman+, 2012); Herbig Ae/Be star, binary system
204211116; 16214199-2313432; APH0000i4g; M7.0; Y (Hsieh+, 2013); T Tauri star
204329690; 16220194-2245410; APH0000ik5; Unknown; Unknown
204449274; 16222160-2217307; APH0000ixr; M5; Y (Luhman+, 2012); T Tauri star, multiple system
204195987; 16224494-2317134; APH0000i2b; M6.0; Y (Evans+, 2009); T Tauri star
204274536; 16233283-2258468; APH0000id3; M5; Y (Evans+, 2009); T Tauri star
203749770; 16271228-2503526; APH0000gha; Unknown; Unknown
203806628; 16271448-2451334; APH0000grp; M5; Y (Ozawa+, 2005); T Tauri star, binary system
203862309; 16274270-2438506; APH0000h2a; M2 ; Y (Gutermuth+, 2009); T Tauri star, multiple system
203995761; 16281673-2405142; APH0000hjb; K5; Y (Cieza+, 2007); T Tauri star
204856535; 16070014-2033092; APH0000k55; M2.75; Y (Luhman+, 2012); T Tauri star, binary system
203850058; 16270659-2441488; APH0000h04; M5.5; Y (MANARA+ 2015); T Tauri star
204512343; 15572109-2202130; APH0000j6a; Unknown; Unknown
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by davidbundy77
Thank you again Ted, the result is better than I expected. It seems this kind of light curve is a very good indication that the star is a YSO with a disk.
The five "unknown" stars are intriguing. Presumably they were too faint to be included in any previous surveys. All five are targets in proposal GO2063 "Planets Around Likely Young Stars in Upper Sco + Rho Oph", so it is very likely that they are indeed also YSOs.
I have looked at these five stars on Aladin Lite and all of them are much brighter in the infrared 2MASS photos, which is further evidence that these are good candidates for YSOs with disks. The star 203749770; 16271228-2503526 is quite near to another star which is even brighter in infrared, so there is possibility of interference in the light curve in this case.
There are surely further examples in the Kepler survey, especially Campaign 2. Martti Holst Kristiansen listed several T-Tauri candidates on "C2 K2 finds" (page3) which I will take a closer look at when I have time. I also encourage other people to post further YSO candidates here.
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by davidbundy77
Here some further YSO candidates. The first 14 stars are from Martti's list, the last two were mentioned by Ted here
EPIC;2MASS ID; SpType; notes;Reference
203410665;16253849-2613540;K7Ve ;"CD-25 11504 -- Emission-line Star; V896 Sco - Variable Star of Orion Type ";Torres+ , 2006
203750883;16133650-2503473;M3.5 ;IR excess;Luhman+, 2012
203791768;16271836-2454537;M3.75 ;T Tauri star, star+dust(IR2);Pillitteri+, 2010
203824153;16285407-2447442;M2;T Tauri star, YSOc_star+dust(IR4);Hsieh+, 2013
203843911;16262367-2443138;K5;T Tauri star, disk 37.5 Mjup;Cieza+, 2010
203936815;16264285-2420299;K6;T Tauri star, YSOc_star+dust(IR3);Hsieh+, 2013
203937317;16261706-2420216;K4.5;T Tauri star, YSOc_star+dust(IR3), binary;Evans+, 2009
203950167;16230923-2417047;G0;YSOc_star+dust(IR1) ;Evans+, 2009
203969672;16270907-2412007;M2.5;T Tauri star, YSOc_star+dust(IR3);Evans+, 2009
204176565;16221852-2321480;G5;YSOc_star+dust(IR1) ;Evans+, 2009, Hsieh+, 2013
204206295;16264741-2314521;K5;Herbig Ae/Be star, star+dust(MP1), transition disk type CTD;Evans+, 2003, Kim+ 2013
204469637;16200616-2212385;M3.5 ;disk type E;Rizzuto+, 2015
204637622;16042097-2130415;M2;T Tauri star, binary, no IR excess;Luhman+, 2012
204807722;15570146-2046184;M3.5 ;IR excess;Luhman+, 2012
204078986;16080745-2345055 ;M6.5;Brown Dwarf, IR excess;Luhman+, 2012
203920354;16262357-2424394 ;K7;T-Tauri star, YSOc;Hsieh+, 2013
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