No substellar objects at the center of the Lupus 3 star-forming cloud

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Table 4

Confirmed and excluded candidate young stellar objects in the target region.

Name	α(2000)	δ (2000)	Mass	Comments

Members
Sz109	16:08:48.16	–39:04:19.2	0.08	M6.5 in Comerón et al. (2003); mass from that work
Par-Lup3-3	16:08:49.40	–39:05:39.3	0.3	M4.5 in Comerón et al. (2003); mass from that work
Par-Lup3-4	16:08:51.43	–39:05:30.4	0.17	M5 in Comerón et al. (2003); underluminous, mass derived
				assuming T_eff = 3100 K and age ~ 2 Myr
Sz 110	16:08:51.57	–39:03:17.7	0.25	M4.5 in Comerón et al. (2003); mass from that work
Sz 112	16:08:55.52	–39:02:33.9	0.12	M6 in Comerón et al. (2003); mass from that work
Sz 113	16:08:57.80	–39:02:22.7	0.09	M6 in Comerón et al. (2003); mass from that work
SSTc2d J160858.3-390736	16:08:58.27	–39:07:35.5	> 1	Deeply embedded, confirmed as Class II YSO by Merín et al. (2008)
				Mass estimated from HK_S photometry alone assuming age ~ 2 Myr
SSTc2d J160858.3-390749	16:08:58.30	–39:07:49.4	~0.4	Deeply embedded, confirmed as Class II YSO by Merín et al. (2008)
				Mass estimated from HK_S photometry alone assuming age ~ 2 Myr
Sz 114	16:09:01.84	–39:05:12.5	0.15	M5.5 in Comerón et al. (2003); mass from that work
Lup 608s	16:09:08.50	–39:03:43.1	0.13	Candidate member in López Martí et al. (2005), X-ray source in
				Gondoin (2006). Estimated spectral type M5 in López Martí et al. (2005),
				slightly later in Comerón et al. (2009); mass adopted is the estimate
				from the latter work
SSTc2d J160916.4-390444	16:09:16.43	–39:04:43.7	0.075	Candidate member in Nakajima et al. (2000), Class II in
				Merín et al. (2008). Very reddened, only JHK_S available
				in the present work. A good fit is obtained with T_eff = 3000 K,
				A_V = 24 mag
Lup3 MMS	16:09:18.07	–39:04:53.4	~0.6	Candidate Class 0 source in Tachihara et al. (2007); adopted mass
				is the estimate for the envelope in that work
SSTc2d J160920.3-390402	16:09:20.30	–39:04:01.6	~0.3	Candidate member in Nakajima et al. (2000), Class II in
				Merín et al. (2008). Found to be variable (amplitude > 0.4 mag in K_S)
				in the present work
				Very reddened, mass estimated from HK_S photometry alone assuming
				age ~ 2 Myr
2MASS J16085427-3906575	16:08:54.27	–39:06:05.9	1.5	Weak T Tauri star in Krautter et al. (1997), spectral type K2 from
				Cieza et al. (2007). Mass derived from published spectral type assuming
				membership in the region
2MASS J16090849-3902133	16:09:08.49	–39:02:13.4	0.4	Source newly identified as candidate member by Comerón et al. (2009),
				mass estimate from that work
SSTc2d J160846.8-390207	16:08:46.79	–39:02:07.4		Candidate Class I in Merín et al. (2008), X-ray rource in Gondoin (2006).
				Clearly resolved as a galaxy in the present work
SSTc2d J160847.5-390509	16:08:47.47	–39:05:08.7		Candidate member in Allen et al. (2007), Class III source in
				Merin et al. (2008). Early photometry probably confused by two
				similarly bright sources within 2′′5
SSTc2d J160853.7-390410	16:08:53.68	–39:04:09.6		Candidate member in Nakajima et al. (2000), Class III in
				Merín et al. (2008). New images shows two sources 2′′ apart,
				the position given by Nakajima et al. lying between both;
				Nakajima et al.’s photomety is probably confused
SSTc2d J160858.9-390446	16:08:58.92	–39:04:46.0		Candidate member in Nakajima et al. (2000), Class III in
				Merín et al. (2008). Found to be variable (amplitude > 0.3 mag in K_S)
				in the present work
SSTc2d J160902.4-390549	16:09:02.44	–39:05:49.4		Candidate member in Nakajima et al. (2000), Class III in
				Merín et al. (2008). Nakajima et al. photomety is
				probably confused by three slightly fainter sources within 2′′7.
				Good fit to R_CI_CJHK_S photometry from present work for T = 6100 K,
				A_V = 5.3; likely background
SSTc2d J160908.0-390726	16:09:07.98	–39:07:26.4		Candidate member in Nakajima et al. (2000), Class III in
				Merín et al. (2008). Images from the present work reveal
				two sources separated by 1′′3. Nakajima et al.’s photometry is thus
				probably confused
Lup 642	16:09:01.56	–39:05:05.6		Tentatively classified as L2 by López Martí et al. (2005), but based on
				highly uncertain photometry. Only 6′′ away from a much brighter source.
				Good fit to I_CJHK_S photometry in the present work with
				T_eff ~ 6400 K, A_V ~ 6.6 mag; possibly background
G 98	16:09:11.00	–39:04:03.0		X-ray source from Gondoin (2006), no near-infrared detected
G 96	16:09:10.60	–39:06:59.0		X-ray source from Gondoin (2006), no near-infrared detected
2MASS J16084969-3901225	16:08:49.69	–39:01:22.5		X-ray source from Gondoin (2006). Relatively blue I_CJHK_S colors
				suggest it to be a hot, lightly reddened background star.

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