If the sale was done yesterday and you are the previous owner, you now no longer own the home, so I think that technically by law you are trespassing on the new owner's property. You are fortunate because, back before this housing crisis and all the new laws to protect home owners who stopped making their mortgage payments and were foreclosed upon by their bank, the new owner would just come out on the day they acquired the property and change the locks. Someone should be contacting you soon and negotiating with you to move out. If you are the prior owner they will serve you with a 3-Day Notice. If you are a tenant then you might be able to stay for the rest of your lease term or 90 days, whichever is greater. This is not legal advice. I recommend that you speak with an attorney familiar with this area of law and find out your rights.
It is always difficult when you lose your home. Hopefully, the new owner will be willing to work with you while you find a new place to live. Good Luck.
Shel-lee Davis BRE #01817412
Real Estate Consultant
International Real Estate Specialist - IRES®
Senior Real Estate Specialist - SRES®
Certified Home Seller Advisor - CHSA®
Certified Home Buyer Advisor - CHBA®
Member - National Association of Certified Expert Advisors - NAEA®
Certified Distressed Property Expert - CDPE®
RE/MAX Estate Properties